Low-dimensional(LD)halide perovskites have attracted considerable attention due to their distinctive structures and exceptional optoelectronic properties,including high absorption coefficients,extended charge carrier ...Low-dimensional(LD)halide perovskites have attracted considerable attention due to their distinctive structures and exceptional optoelectronic properties,including high absorption coefficients,extended charge carrier diffusion lengths,suppressed non-radiative recombination rates,and intense photoluminescence.A key advantage of LD perovskites is the tunability of their optical and electronic properties through the precise optimization of their structural arrangements and dimensionality.This review systematically examines recent progress in the synthesis and optoelectronic characterizations of LD perovskites,focusing on their structural,optical,and photophysical properties that underpin their versatility in diverse applications.The review further summarizes advancements in LD perovskite-based devices,including resistive memory,artificial synapses,photodetectors,light-emitting diodes,and solar cells.Finally,the challenges associated with stability,scalability,and integration,as well as future prospects,are discussed,emphasizing the potential of LD perovskites to drive breakthroughs in device efficiency and industrial applicability.展开更多
Metal halide perovskites(MHPs)with striking electrical and optical properties have appeared at the forefront of semiconductor materials for photocatalytic redox reactions but still suffer from some intrinsic drawbacks...Metal halide perovskites(MHPs)with striking electrical and optical properties have appeared at the forefront of semiconductor materials for photocatalytic redox reactions but still suffer from some intrinsic drawbacks such as inferior stability,severe charge-carrier recombination,and limited active sites.Heterojunctions have recently been widely constructed to improve light absorption,passivate surface for enhanced stability,and promote charge-carrier dynamics of MHPs.However,little attention has been paid to the review of MHPs-based heterojunctions for photocatalytic redox reactions.Here,recent advances of MHPs-based heterojunctions for photocatalytic redox reactions are highlighted.The structure,synthesis,and photophysical properties of MHPs-based heterojunctions are first introduced,including basic principles,categories(such as Schottky junction,type-I,type-II,Z-scheme,and S-scheme junction),and synthesis strategies.MHPs-based heterojunctions for photocatalytic redox reactions are then reviewed in four categories:H2evolution,CO_(2)reduction,pollutant degradation,and organic synthesis.The challenges and prospects in solar-light-driven redox reactions with MHPs-based heterojunctions in the future are finally discussed.展开更多
The efficiency of perovskite solar cells(PSCs)has progressed rapidly,exceeding 26%for single-junction devices and surpassing 34%in perovskite-silicon tandem configurations,establishing PSCs as a promising alternative ...The efficiency of perovskite solar cells(PSCs)has progressed rapidly,exceeding 26%for single-junction devices and surpassing 34%in perovskite-silicon tandem configurations,establishing PSCs as a promising alternative to traditional photovoltaic technologies.However,their commercialization is constrained by significant stability challenges in outdoor environments.This review critically examines key cell-level issues affecting the long-term performance and reliability of PSCs,focusing on instabilities arising from the intrinsic phases of the perovskite absorber and external stress factors.Mitigation strategies to enhance stability are discussed,alongside recent advancements in charge transport layers,electrodes,and interfaces aimed at reducing environmental degradation and improving energy level alignment for efficient charge extraction.The importance of accelerated aging tests and the establishment of standardized protocols is underscored for accurately predicting device lifetimes and identifying failure mechanisms,thereby ensuring stability under real-world conditions.Furthermore,a comprehensive techno-economic analysis evaluates how advancements in materials and strategic innovations influence efficiency,durability,and cost,which are critical for the commercial adoption of PSCs.This review delineates the essential steps required to transition PSC technology from laboratory-scale research to widespread commercialization within the global photovoltaic industry.展开更多
Multicomponent Gd_(1−x)Sm_(x)Ba_(0.5)Sr_(0.5)CoCuO_(5+δ)double perovskites are optimized for application in terms of chemical composi-tion and morphology for the use as oxygen electrodes in solid oxide cells.Structur...Multicomponent Gd_(1−x)Sm_(x)Ba_(0.5)Sr_(0.5)CoCuO_(5+δ)double perovskites are optimized for application in terms of chemical composi-tion and morphology for the use as oxygen electrodes in solid oxide cells.Structural studies of other physicochemical properties are con-ducted on a series of materials obtained by the sol-gel method with different ratios of Gd and Sm cations.It is documented that changing the x value,and the resulting adjustment of the average ionic radius,have a significant impact on the crystal structure,stability,as well as on the total conductivity and thermomechanical properties of the materials,with the best results obtained for the Gd_(0.75)Sm_(0.2)5Ba_(0.5)Sr_(0.5)CoCuO_(5+δ)composition.Oxygen electrodes are prepared using the selected compound,allowing to obtain low polarization resistance values,such as 0.086Ω·cm^(2)at 800℃.Systematic studies of electrocatalytic activity are conducted using La_(0.8)Sr_(0.2)Ga_(0.8)Mg_(_(0.2))O_(3−δ)as the electrolyte for all electrodes,and Ce_(0.8)Gd_(0.2)O_(2−δ)electrolyte for the best performing Gd_(0.75)Sm_(0.2)5Ba_(0.5)Sr_(0.5)CoCuO_(5+δ)electrodes.The electrochemical data are analyzed using the distribution of relaxation times method.Also,the influence of the preparation method of the electrode material is in-ve`stigated using the electrospinning technique.Finally,the performance of the Gd_(0.75)Sm_(0.2)5Ba_(0.5)Sr_(0.5)CoCuO_(5+δ)electrodes is tested in a Ni-YSZ(yttria-stabilized zirconia)anode-supported cell with a Ce_(0.8)Gd_(0.2)O_(2−δ)buffer layer,in the fuel cell and electrolyzer operating modes.With the electrospun electrode,a power density of 462 mW·cm^(−2)is obtained at 700℃,with a current density of ca.0.2 A·cm^(−2)at 1.3 V for the electrolysis at the same temperature,indicating better performance compared to the sol-gel-based electrode.展开更多
Tin-lead(Sn-Pb)mixed perovskites are extensively investigated in near-infrared(NIR)photodetectors(PDs)owing to their excellent photoelectric performance.However,achieving high-performance Sn-Pb mixed PDs remains chall...Tin-lead(Sn-Pb)mixed perovskites are extensively investigated in near-infrared(NIR)photodetectors(PDs)owing to their excellent photoelectric performance.However,achieving high-performance Sn-Pb mixed PDs remains challenging,primarily because of the rapid crystallization and the susceptibility of Sn^(2+) to oxidation.To ad⁃dress these issues,this study introduces the multifunctional molecules 2,3-difluorobenzenamine(DBM)to modulate the crystallization of Sn-Pb mixed perovskites and retard the oxidation of Sn^(2+),thereby significantly enhancing film quality.Compared with the pristine film,Sn-Pb mixed perovskite films modulated by DBM molecules exhibit a high⁃ly homogeneous morphology,reduced roughness and defect density.The self-powered NIR PDs fabricated with the improved films have a spectral response range from 300 nm to 1100 nm,a peak responsivity of 0.51 A·W^(-1),a spe⁃cific detectivity as high as 2.46×10^(11)Jones within the NIR region(780 nm to 1100 nm),a linear dynamic range ex⁃ceeding 152 dB,and ultrafast rise/fall time of 123/464 ns.Thanks to the outstanding performance of PDs,the fabri⁃cated 5×5 PDs array demonstrates superior imaging ability in the NIR region up to 980 nm.This work advances the development of Sn-Pb mixed perovskites for NIR detection and paves the way for their commercialization.展开更多
Lead-free vacancy-ordered double perovskites have emerged as promising materials for optoelectronic applications due to their environmentally friendly characteristics and exceptional properties.However,conventional sy...Lead-free vacancy-ordered double perovskites have emerged as promising materials for optoelectronic applications due to their environmentally friendly characteristics and exceptional properties.However,conventional synthesis methods often depend on toxic reagents and stringent conditions,limiting their large-scale synthesis and practical application.In this work,an environmentally friendly synthesis route was proposed for preparing vacancy-ordered double perovskites Cs_(2)SnX_(6)(X=Cl,Br,and I)with high crystallinity under low-temperature and ambient-pressure conditions.This method utilizes ion liquid(i.e.,1-butyl-3-methylimidazolium chloride([Bmim]Cl),1-butyl-3-methylimidazolium bromide([Bmim]Br)and 1-butyl-3-methylimidazolium iodide([Bmim]I))in combination with saturated aqueous solutions of ammonium halides as solvents,replacing traditional hydrogen halide acid or polar organic solvents.Experimental and characterization results demonstrate that the Cs_(2)SnX_(6)(X=Cl,Br,and I)possess high crystallinity,well-defined morphology,and improved thermal stability.These improvements are attributed to the hydrogen bonding interactions between ionic liquids and the perovskite precursors.Additionally,the halogen-rich environment provided by ionic liquids and ammonium halide salts facilitates defect passivation.Furthermore,this method is applicable to the synthesis of doped perovskite crystals,demonstrated by the successful synthesis of Bi-doped Cs_(2)SnCl_(6) crystals with a photoluminescence quantum efficiency of 12.73%.This study presents a novel strategy for synthesizing high-quality vacancy-ordered double perovskites and their doping or alloyed compounds.展开更多
Incorporating organic bulky cations in the precursor or post-treatment to achieve two-dimensional/thr ee-dimensional(2D/3D)heterojunction is an effective strategy for enhancing the stability of perovskite materials.Ho...Incorporating organic bulky cations in the precursor or post-treatment to achieve two-dimensional/thr ee-dimensional(2D/3D)heterojunction is an effective strategy for enhancing the stability of perovskite materials.However,the issue of insufficient charge transport in 2D perovskites limits their development,and the fundamental mechanism of out-of-plane carrier transport remains unclear.This study designed and synthesized seven organic phenyl-core cations,differentiated at the 1-and 1,4-positions,and identified the impacts on the corresponding properties of the 2D crystalline perovskite.Shorter cations facilitated a more compact arrangement of adjacent inorganic layers,aligning to favor charge transport along the vertical direction.In addition,introducing high electronegativity led to increased intermolecular interactions,resulting in enhanced structural stability and improved phenyl ring π-orbital overlap and interlayer electron coupling,yielding efficient charge transport.Resilience to thermal stressing of the perovskite was strongly correlated with the carbon chain length of the spacer cations.The increase in cation length and the reduction in the rigidity of the amino-terminal both aided in the dispersion of thermal stress in the inorganic framework.Additional hydrogen bonding also contributed to mitigating structural disorder.展开更多
Two-dimensional(2D)chiral halide perovskites(CHPs)have attracted broad interest due to their distinct spin-dependent properties and promising applications in chiroptics and spintronics.Here,we report a new type of 2D ...Two-dimensional(2D)chiral halide perovskites(CHPs)have attracted broad interest due to their distinct spin-dependent properties and promising applications in chiroptics and spintronics.Here,we report a new type of 2D CHP single crystals,namely R/S-3BrMBA_(2)PbBr_(4).The chirality of the as-prepared samples is confirmed by exploiting circular dichroism spectroscopy,indicating a successful chirality transfer from chiral organic cations to their inorganic perovskite sublattices.Furthermore,we observed bright photoluminescence spanning from 380 to 750 nm in R/S-3BrMBA_(2)PbBr_(4)crystals at room temperature.Such broad photoluminescence originates from free excitons and self-trapped excitons.In addition,efficient second-harmonic generation(SHG)performance was observed in chiral perovskite single crystals with high circular polarization ratios and non-linear optical circular dichroism.This demonstrates that R/S-3BrMBA_(2)PbBr_(4)crystals can be used to detect and generate left-and righthanded circularly polarized light.Our study provides a new platform to develop high-performance chiroptical and spintronic devices.展开更多
The half metallic character in double perovskites makes them highly sought-after materials for the use in spintronics applications.Spintronic devices can operate at far higher speeds with less power consumption which ...The half metallic character in double perovskites makes them highly sought-after materials for the use in spintronics applications.Spintronic devices can operate at far higher speeds with less power consumption which has the potential to eventually replace traditional electronics.In this manuscript,we theoretically investigated the physical properties of europium based double perovskites Eu_(2)XWO_(6)(X=Mg,Zn).The volume optimization was done for both compounds,which demonstrate complete structural stability,while their thermodynamic stability is confirmed through the calculated formation energies.The mechanical properties reveal that both studied compounds fulfill the Born's stability criteria.The electronic properties of Eu_(2)MgWO_(6)and Eu_(2)ZnWO_(6)reveal that in spin up channel both materials exhibit metallic character,while in spin down channel,indirect band gaps of 4.11 and 3.97 eV are noticed for Eu_(2)MgWO_(6)and Eu_(2)ZnWO_(6),respectively,showing half-metallic behavior.The examination of the magnetic properties shows a significant magnetic moment of 14μ_(B)for Eu_(2)XWO_(6)(X=Mg,Zn).High optical conductivity and absorption are noticed in the UV region as shown by the optical traits of Eu_(2)XWO_(6)(X=Mg,Zn).Both materials show high magnetic moments,which leads to high spin polarization and are considered highly effective for the functioning of spintronic devices.展开更多
Phonon coherence can reflect electron‒phonon coupling information and has been proven to modulate electronic states and charge transport.The manipulation of phonon coherence through spacer cation engineering in organi...Phonon coherence can reflect electron‒phonon coupling information and has been proven to modulate electronic states and charge transport.The manipulation of phonon coherence through spacer cation engineering in organic‒inorganic hybrid perovskites(OIHPs)has been extensively demonstrated;however,the underlying structural origin remains elusive at the molecular level.Herein,we present molecular structure and temperature-dependent coherent phonon studies via a combination of sum frequency generation vibrational spectroscopy(SFG-VS)and transient absorption spectroscopy(TAS).The conformational order of spacer cations dictates the coherent phonon oscillations in 2D OIHPs.Our study further analyzes the static order and dynamic disorder in 2D perovskites.This work provides molecular-level insights into the role of spacer cations in tuning structural order and may provide valuable guidance for advancing emergent optoelecltronics development.展开更多
The exploitation of organic-inorganic hybrid perovskites(OIHPs) as active layer materials for typical sandwich-structured resistive memories has attracted widespread interest due to the property of low power consumpti...The exploitation of organic-inorganic hybrid perovskites(OIHPs) as active layer materials for typical sandwich-structured resistive memories has attracted widespread interest due to the property of low power consumption and fast switching. However, the inherent thermal instability of perovskites limits the application of OIHPs-based resistive memories under extreme conditions, while the infiuence of thermal effects on their resistance change characteristics remains unclear. Herein, a novel 2D <100>-oriented high-temperature resistant OIHP [(BIZ-H)_(2)(PbBr_(4))]n(BIZ = benzimidazole) is prepared as an active layer material to fabricate FTO/[(BIZ-H)_(2)(PbBr_(4))]n/Ag resistive memory with excellent thermal reproducibility and stability up to 120℃. The increase in temperature leads to a decrease in the PbBr_(6) octahedral distortion in the crystal structure, an increase in hydrogen bonding between the(BIZ-H)+cation and the(PbBr_(4))_(n)^(2n-)layer, and a shortening of the spacing of the inorganic layers, which is found to result in the creation and predominance of thermally activated traps with increasing temperature. This work provides a new direction for the next generation of OIHPs-based resistive memories with high-temperature tolerance.展开更多
Quasi-two-dimensional(2D)perovskite embodies characteristics of both three-dimensional(3D)and 2D perovskites,achieving the superior external environment stability structure of 2D perovskites alongside the high efficie...Quasi-two-dimensional(2D)perovskite embodies characteristics of both three-dimensional(3D)and 2D perovskites,achieving the superior external environment stability structure of 2D perovskites alongside the high efficiency of 3D perovskites.This effect is realized through critical structural modifications in device fabrication.Typically,perovskites have an octahedral structure,generally ABX3,where an organic ammonium cation(A’)participates in forming the perovskite structure,with A’_(n)(n=1 or 2)sandwiched between A_(n-1)B_(n)X_(3n+1)perovskite layers.Depending on whether A’is a monovalent or divalent cation,2D perovskites are classified into Ruddlesden-Popper perovskite or Dion-Jacobson perovskite,each generating different structures.Although each structure achieves similar effects,they incorporate distinct mechanisms in their formation.And according to these different structures,various properties appear,and additive and optimizing methods to increase the efficiency of 3D perovskites also exist in 2D perovskites.In this review,scientific understanding and engineering perspectives of the quasi-2D perovskite is investigated,and the optimal structure quasi-2D and the device optimization is also discussed to provide the insight in the field.展开更多
Photodetectors with weak-light detection capabilities play an indispensable role in various crucial fields such as health monitors,imaging,optical communication,and etc.Nevertheless,the detection of weak light signals...Photodetectors with weak-light detection capabilities play an indispensable role in various crucial fields such as health monitors,imaging,optical communication,and etc.Nevertheless,the detection of weak light signals is often severely interfered by multiple factors such as background light,dark noise and circuit noise,making it difficult to accurately capture signals.While traditional technologies like silicon photomultiplier tubes excel in sensitivity,their high cost and inherent fragility restrict their widespread application.Against this background,perovskite materials have rapidly emerged as a research focus in the field of photodetection due to their simple preparation processes and exceptional optoelectronic properties.Not only are the preparation processes of perovskite materials straightforward and cost-effective,but more importantly,they can be flexibly integrated into flexible and stretchable substrates.This characteristic significantly compensates for the shortcomings of traditional rigid electronic devices in specific application scenarios,opening up entirely new possibilities for photodetection technology.Herein,recent advances in perovskite light detection technology are reviewed.Firstly,the chemical and physical properties of perovskite materials are discussed,highlighting their remarkable advantages in weak-light detection.Subsequently,the review systematically organizes various preparation techniques of perovskite materials and analyses their advantages in different application scenarios.Meanwhile,from the two core dimensions of performance improvement and light absorption enhancement,the key strategies of improving the performance of perovskite weak-light photodetectors are explored.Finally,the review concludes with a brief summary and a discussion on the potential challenges that may arise in the further development of perovskite devices.展开更多
Generally,referring to the stability of perovskite,the most studied perovskite material has been MA-free mixed-cationperovskite.The precise role of MA in the light-thermal-humid stability of perovskite solar cells sti...Generally,referring to the stability of perovskite,the most studied perovskite material has been MA-free mixed-cationperovskite.The precise role of MA in the light-thermal-humid stability of perovskite solar cells still lacks ofa systematically understanding.In this work,the evolution of crystallographic structures,intermediate phase,ultrafast dynamics,and thermal decomposition behavior of MA-mixed perovskite FA_(1-x)MA_(x)PbI_(3)(x=0–100%)areinvestigated.The influence of MA on the stability of devices under heat,light,and humidity exposure arerevealed.In the investigated compositional space(x=0–100%),device efficiencies vary from 19.5%to 22.8%,andthe light,thermal,and humidity exposure stability of the related devices are obviously improved forFA1-xMAxPbI_(3)(x=20%–30%).Incorporation 20%–30%of MA cations lowers nucleation barrier and causes asignificant volume shrinkage,which enhances the interaction between FA and I,thus improving crystallizationand stability of the FA_(1-x)MA_(x)PbI_(3).Thermal behavior analysis reveals that the decomposition temperature of FA_(0.8)MA_(0.2)PbI_(3)reaches 247℃(FAPbI_(3),233℃)and trace amounts of MA cations enhance the thermal stability ofthe perovskite.Remarkably,we observe lattice shrinkage using spherical aberration corrected transmissionelectron microscope(AC-TEM).This work implies that stabilizing perovskites will be realized by incorporatingtrace amounts of MA,which improve the crystallization and carrier transport,leading to improved stability andperformances.展开更多
One-dimensional perovskites possess unique photoelectric properties that distinguish them from other perovskitetypes, making them a focal point in photoelectric research. In recent years, there has been a significant ...One-dimensional perovskites possess unique photoelectric properties that distinguish them from other perovskitetypes, making them a focal point in photoelectric research. In recent years, there has been a significant surge ininterest surrounding the synthesis and application of one-dimensional anisotropic perovskites, spurred by ad-vancementsin synthesis techniques and notable breakthroughs in novel methodologies and application proper-ties.This article provides a comprehensive review of the progress made in research on one-dimensionalanisotropic perovskites, detailing the synthesis mechanisms and potential pathways for performance enhance-mentin various applications. We highlight the crucial role of controllable synthesis and heterogeneous effect intailoring perovskite properties to boost application efficacy. Initially, this review examines the primary synthesismethods and mechanisms for creating heterogeneously induced one-dimensional anisotropic perovskites, cate-gorizingthem into two main approaches: the classical wet chemical synthesis, which utilizes selective ligands, andthe ligand-free, substrate-assisted method. The precision in controllable synthesis is essential for fabricatingheterogeneous structures, where the synthesized precursor, shape, and surface ligand significantly influence theinterfacial strength of the heterogenic interface. We also discuss the key features that must be improved for high-performanceapplications, exploring how heterogeneous effects can enhance performance and drive the devel-opmentof heterogeneous devices in various applications, such as photodetectors, solar cells, light-emitting di-odes,and photocatalysis. Conclusively, by highlighting the emerging potential and promising opportunitiesoffered by strategic heterogeneous construction, we forecast a dynamic and transformative future for their pro-ductionand application landscapes.展开更多
Linearly polarized photodetectors(PDs),leveraging the inherent structural and material information encoded in light's polarization state,hold transformative potential for applications ranging from remote sensing t...Linearly polarized photodetectors(PDs),leveraging the inherent structural and material information encoded in light's polarization state,hold transformative potential for applications ranging from remote sensing to biomedical imaging.Traditional systems that rely on external polarizing elements face challenges in miniaturization and efficiency,driving interest in materials with intrinsic anisotropy.Low-dimensional metal halide perovskites,distinguished by their tunable bandgaps,high carrier mobility,and quantum confinement effects,have emerged as a groundbreaking platform for next-generation polarized PDs.This review comprehensively summarizes the theory,materials,and device engineering of linearly polarized PDs based on low-dimensional perovskites.It aims to elucidate polarization mechanisms across dimensions by establishing a rigorous theoretical foundation for linearly polarized PDs of low-dimensional perovskites.Beyond theoretical insights,the review also highlights cutting-edge fabrication techniques for one-dimensional nano wires and two-dimensional heterostructures,along with performance benchmarks of state-of-the-art devices.By integrating experimental advancements with theoretical insights,this work not only advances the fundamental understanding of polarization mechanisms but also outlines actionable pathways for optimizing device performance,stability,and scalability,which may serve as a critical resource for researchers aiming to harness the full potential of low-dimensional perovskites in polarized optoelectronics.展开更多
Cd-based Cs_(7)Cd_(3)Br_(13)perovskites,featuring both tetrahedral and octahedral polyhedral structures,have garnered significant acclaim for their efficient luminescent performance achieved through multi-exciton stat...Cd-based Cs_(7)Cd_(3)Br_(13)perovskites,featuring both tetrahedral and octahedral polyhedral structures,have garnered significant acclaim for their efficient luminescent performance achieved through multi-exciton state regulation by doping.However,it remains controversial whether the doping sites are in the octahedra or tetrahedra of Cs_(7)Cd_(3)Br_(13).To address this,we introduced Pb^(2+)and Sb^(3+)ions and,supported by experimental and theoretical evidence,demonstrated that these ions preferentially occupy the octahedra.Among them,Pb^(2+)ions single doping achieves a near-unity photoluminescence quantum yield of 93.7%,which results in excellent X-ray scintillation performance,high light yield of 41,772 photon MeV^(-1),and a low detection limit of 29.78 nGyairs-1.Moreover,this incorporation of Pb^(2+)and Sb^(3+)enabled an exciton state regulation strategy,resulting in standard white light emission with CIE chromaticity coordinates of(0.33,0.33).Additionally,a multifaceted optical anticounterfeiting and information encryption scheme was designed based on the differences in optical properties caused by the different sensitivities of[PbBr6]4-octahedron and[SbBr6]3-octahedron to temperature and excitation wavelengths.These diverse photoluminescence characteristics provide new insights and practical demonstrations for advanced X-ray imaging,lighting,optical encryption,and anticounterfeiting technologies.展开更多
In past decades,ABX_(3) halide perovskites have attracted great interest in solar cells due to excellent opto-electronic properties,such as high carrier mobility.However,instability and toxicity are obstacles on the c...In past decades,ABX_(3) halide perovskites have attracted great interest in solar cells due to excellent opto-electronic properties,such as high carrier mobility.However,instability and toxicity are obstacles on the commercial route for perovskites.Many studies have turned to exploring A_(2) BX_(6) and A_(3) B_(2) X_(9) for better stability.Unfortunately,the carrier mobilities of these two types are inferior to ABX_(3),lower by an order of magnitude.Furthermore,the mobility of ABX_(3) is distributed over a large range of 1.78-4500 cm^(2) V^(−1) s^(−1) in experiments,which contributes to another diversity of mobilities.In this paper,we aim at reveal-ing the physical origin of the above-mentioned diversities by theoretical studies on CsBX_(3),Cs_(2) BX_(6),and Cs_(3) B_(2) X_(9)(B=Sn,Pb,Sb,Bi,X=Br,Cl).The difference in group velocities is the major reason responsible for the variation in these types.The unique three-dimensional connected conductive network of CsBX_(3) determines its large group velocity.As for carrier scattering,ionized impurity scattering dominates at low carrier and high ionized impurity concentrations.Detailed analysis reveals that band degeneracy is strongly related to the impurity scattering rate,while dielectric constant is almost immune.Our study provides a better understanding of the relationship between electronic structures and mobilities for po-tential applications in photovoltaics.展开更多
A conventional solid-state process was used to synthesize the double perovskite materials HoRCoMnO_(6)(R=Ho,Gd,Eu,Nd).The structural properties of the compounds were investigated using X-ray powder diffraction(XRD).Th...A conventional solid-state process was used to synthesize the double perovskite materials HoRCoMnO_(6)(R=Ho,Gd,Eu,Nd).The structural properties of the compounds were investigated using X-ray powder diffraction(XRD).The results revealed that Ho_(2)CoMnO_(6) crystallizes in a monoclinic structure with the P2_(1)/n space group.In contrast,the other compounds HoRCoMnO_(6)(R=Gd,Eu,or Nd) exhibit an orthorhombic structure with the Pnma space group.As a result,the average crystallite size also changes as a function of rare-earth element doping.This investigation reveals that the magnetic properties of the compounds studied are significantly dependent on the doping elements.The Curie temperature T_C,for example,increases from 80 to 118℃ with the ionic radii of rare earths increasing.Furthermore,the study of the magnetocaloric effect(MCE) shows that the maximum of the entropy variation(-ΔS_(M)^(max)) increases from 4.97 to 6.06 J/(kg·K) under a magnetic field of 5 T with substitution by rare-earth ions.To examine the efficiency of MCE materials,the relative cooling power(RCP) was evaluated and is found to increase with increment of rare-earth radius till 406.69 J/kg for Nd.The mean entropy variation with tempe rature(TEC) was also studied.Due to their significant magnetocaloric performance,HoRCoMnO_(6)(noted as HRCMO) compounds(with R=Ho,Gd,Eu or Nd) could be good candidates for low-temperature magnetic cooling applications.展开更多
Recently,organic-inorganic halide perovskite has received much attention because of its low cost and high efficiency in solar cells.Herein,we have performed the first-principles investigation to explore the structure,...Recently,organic-inorganic halide perovskite has received much attention because of its low cost and high efficiency in solar cells.Herein,we have performed the first-principles investigation to explore the structure,stability,electronic properties,and optical properties of AZBI_(3)(B=Pb,Sn,Ge)and AZSnI_(3−y)Br_(y)(y=1,2,3)perovskites.The tolerance factor(τ),octahedral factor(μ),and formation energies were calculated to evaluate the structural thermodynamic stability of six perovskites.The band gap and structures have been obtained,indicating that Sn/Ge replacement and Br-doping decrease the band gap.Similarly,B-site replacement and X-site doping affect the optical properties.All the absorption spectra of six perovskites cover the visible light region,and AZSnI_(3)/AZSnI2Br perovskites are the most outstanding.They are likely to be good candidates for use in solar cells.展开更多
基金funding from FCT(Fundagao para a Ciencia e Tecnologia,I.P.)under the projects LA/P/0037/2020,UIDP/50025/2020 and UIDB/50025/2020 of the Associate Laboratory Institute of Nanostructures,Nanomodelling and Nanofabrication-i3Nby the projects FlexSolar(PTDC/CTM-REF/1008/2020),and SpaceFlex(2022.01610.PTDC,DOI:10.54499/2022.01610.PTDC)+1 种基金supported by the project M-ECO2-Industrial Cluster for advanced biofuel production,Ref.C644930471-00000041,R2U Technologies and Befunding from the European Union via the project X-STREAM(Horizon EU,ERC CoG,No 101124803)the support of a fellowship from the"la Caixa"Foundation(ID 100010434)。
文摘Low-dimensional(LD)halide perovskites have attracted considerable attention due to their distinctive structures and exceptional optoelectronic properties,including high absorption coefficients,extended charge carrier diffusion lengths,suppressed non-radiative recombination rates,and intense photoluminescence.A key advantage of LD perovskites is the tunability of their optical and electronic properties through the precise optimization of their structural arrangements and dimensionality.This review systematically examines recent progress in the synthesis and optoelectronic characterizations of LD perovskites,focusing on their structural,optical,and photophysical properties that underpin their versatility in diverse applications.The review further summarizes advancements in LD perovskite-based devices,including resistive memory,artificial synapses,photodetectors,light-emitting diodes,and solar cells.Finally,the challenges associated with stability,scalability,and integration,as well as future prospects,are discussed,emphasizing the potential of LD perovskites to drive breakthroughs in device efficiency and industrial applicability.
基金financially supported by National Natural Science Foundation of China(No.22302155)the Fundamental Research Funds of the Center Universities(No.D5000240188)the research program of ZJUT(YJY-ZS-20240001)。
文摘Metal halide perovskites(MHPs)with striking electrical and optical properties have appeared at the forefront of semiconductor materials for photocatalytic redox reactions but still suffer from some intrinsic drawbacks such as inferior stability,severe charge-carrier recombination,and limited active sites.Heterojunctions have recently been widely constructed to improve light absorption,passivate surface for enhanced stability,and promote charge-carrier dynamics of MHPs.However,little attention has been paid to the review of MHPs-based heterojunctions for photocatalytic redox reactions.Here,recent advances of MHPs-based heterojunctions for photocatalytic redox reactions are highlighted.The structure,synthesis,and photophysical properties of MHPs-based heterojunctions are first introduced,including basic principles,categories(such as Schottky junction,type-I,type-II,Z-scheme,and S-scheme junction),and synthesis strategies.MHPs-based heterojunctions for photocatalytic redox reactions are then reviewed in four categories:H2evolution,CO_(2)reduction,pollutant degradation,and organic synthesis.The challenges and prospects in solar-light-driven redox reactions with MHPs-based heterojunctions in the future are finally discussed.
基金supported by a National Research Foundation of Korea(NRF)grant(No.2016R1A3B 1908249),funded by the Korean government.
文摘The efficiency of perovskite solar cells(PSCs)has progressed rapidly,exceeding 26%for single-junction devices and surpassing 34%in perovskite-silicon tandem configurations,establishing PSCs as a promising alternative to traditional photovoltaic technologies.However,their commercialization is constrained by significant stability challenges in outdoor environments.This review critically examines key cell-level issues affecting the long-term performance and reliability of PSCs,focusing on instabilities arising from the intrinsic phases of the perovskite absorber and external stress factors.Mitigation strategies to enhance stability are discussed,alongside recent advancements in charge transport layers,electrodes,and interfaces aimed at reducing environmental degradation and improving energy level alignment for efficient charge extraction.The importance of accelerated aging tests and the establishment of standardized protocols is underscored for accurately predicting device lifetimes and identifying failure mechanisms,thereby ensuring stability under real-world conditions.Furthermore,a comprehensive techno-economic analysis evaluates how advancements in materials and strategic innovations influence efficiency,durability,and cost,which are critical for the commercial adoption of PSCs.This review delineates the essential steps required to transition PSC technology from laboratory-scale research to widespread commercialization within the global photovoltaic industry.
基金funded by the National Science Centre,Poland,on the basis of the decision number UMO-2020/37/B/ST8/02097supported by the program“Excellence Initiative-Research University”for the AGH University of Krakow(IDUB AGH,No.501.696.7996,Action 4,ID 9880).
文摘Multicomponent Gd_(1−x)Sm_(x)Ba_(0.5)Sr_(0.5)CoCuO_(5+δ)double perovskites are optimized for application in terms of chemical composi-tion and morphology for the use as oxygen electrodes in solid oxide cells.Structural studies of other physicochemical properties are con-ducted on a series of materials obtained by the sol-gel method with different ratios of Gd and Sm cations.It is documented that changing the x value,and the resulting adjustment of the average ionic radius,have a significant impact on the crystal structure,stability,as well as on the total conductivity and thermomechanical properties of the materials,with the best results obtained for the Gd_(0.75)Sm_(0.2)5Ba_(0.5)Sr_(0.5)CoCuO_(5+δ)composition.Oxygen electrodes are prepared using the selected compound,allowing to obtain low polarization resistance values,such as 0.086Ω·cm^(2)at 800℃.Systematic studies of electrocatalytic activity are conducted using La_(0.8)Sr_(0.2)Ga_(0.8)Mg_(_(0.2))O_(3−δ)as the electrolyte for all electrodes,and Ce_(0.8)Gd_(0.2)O_(2−δ)electrolyte for the best performing Gd_(0.75)Sm_(0.2)5Ba_(0.5)Sr_(0.5)CoCuO_(5+δ)electrodes.The electrochemical data are analyzed using the distribution of relaxation times method.Also,the influence of the preparation method of the electrode material is in-ve`stigated using the electrospinning technique.Finally,the performance of the Gd_(0.75)Sm_(0.2)5Ba_(0.5)Sr_(0.5)CoCuO_(5+δ)electrodes is tested in a Ni-YSZ(yttria-stabilized zirconia)anode-supported cell with a Ce_(0.8)Gd_(0.2)O_(2−δ)buffer layer,in the fuel cell and electrolyzer operating modes.With the electrospun electrode,a power density of 462 mW·cm^(−2)is obtained at 700℃,with a current density of ca.0.2 A·cm^(−2)at 1.3 V for the electrolysis at the same temperature,indicating better performance compared to the sol-gel-based electrode.
基金Supported by National Key Research and Development Program of China(2022YFA1404201)National Natural Science Foundation of China(62205187,U23A20380,U22A2091,62222509,62127817,62075120)+3 种基金Changjiang Scholars and Innovative Research Team in University of Ministry of Education of China(IRT_17R70)Fundamental Research Program of Shanxi Province(202103021223032,202303021222031)Project Funded by China Postdoctoral Science Foundation(2022M722006)Fund for Shanxi“1331 Project”Key Subjects Construction。
文摘Tin-lead(Sn-Pb)mixed perovskites are extensively investigated in near-infrared(NIR)photodetectors(PDs)owing to their excellent photoelectric performance.However,achieving high-performance Sn-Pb mixed PDs remains challenging,primarily because of the rapid crystallization and the susceptibility of Sn^(2+) to oxidation.To ad⁃dress these issues,this study introduces the multifunctional molecules 2,3-difluorobenzenamine(DBM)to modulate the crystallization of Sn-Pb mixed perovskites and retard the oxidation of Sn^(2+),thereby significantly enhancing film quality.Compared with the pristine film,Sn-Pb mixed perovskite films modulated by DBM molecules exhibit a high⁃ly homogeneous morphology,reduced roughness and defect density.The self-powered NIR PDs fabricated with the improved films have a spectral response range from 300 nm to 1100 nm,a peak responsivity of 0.51 A·W^(-1),a spe⁃cific detectivity as high as 2.46×10^(11)Jones within the NIR region(780 nm to 1100 nm),a linear dynamic range ex⁃ceeding 152 dB,and ultrafast rise/fall time of 123/464 ns.Thanks to the outstanding performance of PDs,the fabri⁃cated 5×5 PDs array demonstrates superior imaging ability in the NIR region up to 980 nm.This work advances the development of Sn-Pb mixed perovskites for NIR detection and paves the way for their commercialization.
基金financially supported by the Beijing Natural Science Foundation,China(Nos.2254087 and 2242008)the Beijing Information Science and Technology University Foundation,China(No.1925008)Beijing Information Science and Technology University Young Faculty Support Program,China(No.YBT202411).
文摘Lead-free vacancy-ordered double perovskites have emerged as promising materials for optoelectronic applications due to their environmentally friendly characteristics and exceptional properties.However,conventional synthesis methods often depend on toxic reagents and stringent conditions,limiting their large-scale synthesis and practical application.In this work,an environmentally friendly synthesis route was proposed for preparing vacancy-ordered double perovskites Cs_(2)SnX_(6)(X=Cl,Br,and I)with high crystallinity under low-temperature and ambient-pressure conditions.This method utilizes ion liquid(i.e.,1-butyl-3-methylimidazolium chloride([Bmim]Cl),1-butyl-3-methylimidazolium bromide([Bmim]Br)and 1-butyl-3-methylimidazolium iodide([Bmim]I))in combination with saturated aqueous solutions of ammonium halides as solvents,replacing traditional hydrogen halide acid or polar organic solvents.Experimental and characterization results demonstrate that the Cs_(2)SnX_(6)(X=Cl,Br,and I)possess high crystallinity,well-defined morphology,and improved thermal stability.These improvements are attributed to the hydrogen bonding interactions between ionic liquids and the perovskite precursors.Additionally,the halogen-rich environment provided by ionic liquids and ammonium halide salts facilitates defect passivation.Furthermore,this method is applicable to the synthesis of doped perovskite crystals,demonstrated by the successful synthesis of Bi-doped Cs_(2)SnCl_(6) crystals with a photoluminescence quantum efficiency of 12.73%.This study presents a novel strategy for synthesizing high-quality vacancy-ordered double perovskites and their doping or alloyed compounds.
基金financially supported by the Key Fund Project of Tianjin Natural Science Foundation(24JCZDJC00510)the Fundamental Research Funds for the Central Universitiespartially supported by the U.S.Department of Energy under Contract No.DE-AC3608GO28308 with Alliance for Sustainable Energy,Limited Liability Company(LLC),the Manager and Operator of the National Renewable Energy Laboratory,through Grant No.DE-SC0020718。
文摘Incorporating organic bulky cations in the precursor or post-treatment to achieve two-dimensional/thr ee-dimensional(2D/3D)heterojunction is an effective strategy for enhancing the stability of perovskite materials.However,the issue of insufficient charge transport in 2D perovskites limits their development,and the fundamental mechanism of out-of-plane carrier transport remains unclear.This study designed and synthesized seven organic phenyl-core cations,differentiated at the 1-and 1,4-positions,and identified the impacts on the corresponding properties of the 2D crystalline perovskite.Shorter cations facilitated a more compact arrangement of adjacent inorganic layers,aligning to favor charge transport along the vertical direction.In addition,introducing high electronegativity led to increased intermolecular interactions,resulting in enhanced structural stability and improved phenyl ring π-orbital overlap and interlayer electron coupling,yielding efficient charge transport.Resilience to thermal stressing of the perovskite was strongly correlated with the carbon chain length of the spacer cations.The increase in cation length and the reduction in the rigidity of the amino-terminal both aided in the dispersion of thermal stress in the inorganic framework.Additional hydrogen bonding also contributed to mitigating structural disorder.
基金supported by Natural Science Foundation of Jiangsu Province,Major Project(BK20222007).
文摘Two-dimensional(2D)chiral halide perovskites(CHPs)have attracted broad interest due to their distinct spin-dependent properties and promising applications in chiroptics and spintronics.Here,we report a new type of 2D CHP single crystals,namely R/S-3BrMBA_(2)PbBr_(4).The chirality of the as-prepared samples is confirmed by exploiting circular dichroism spectroscopy,indicating a successful chirality transfer from chiral organic cations to their inorganic perovskite sublattices.Furthermore,we observed bright photoluminescence spanning from 380 to 750 nm in R/S-3BrMBA_(2)PbBr_(4)crystals at room temperature.Such broad photoluminescence originates from free excitons and self-trapped excitons.In addition,efficient second-harmonic generation(SHG)performance was observed in chiral perovskite single crystals with high circular polarization ratios and non-linear optical circular dichroism.This demonstrates that R/S-3BrMBA_(2)PbBr_(4)crystals can be used to detect and generate left-and righthanded circularly polarized light.Our study provides a new platform to develop high-performance chiroptical and spintronic devices.
基金financially supported by Ongoing Research Funding Program,(ORF-2025-445),King Saud University,Riyadh,Saudi Arabia。
文摘The half metallic character in double perovskites makes them highly sought-after materials for the use in spintronics applications.Spintronic devices can operate at far higher speeds with less power consumption which has the potential to eventually replace traditional electronics.In this manuscript,we theoretically investigated the physical properties of europium based double perovskites Eu_(2)XWO_(6)(X=Mg,Zn).The volume optimization was done for both compounds,which demonstrate complete structural stability,while their thermodynamic stability is confirmed through the calculated formation energies.The mechanical properties reveal that both studied compounds fulfill the Born's stability criteria.The electronic properties of Eu_(2)MgWO_(6)and Eu_(2)ZnWO_(6)reveal that in spin up channel both materials exhibit metallic character,while in spin down channel,indirect band gaps of 4.11 and 3.97 eV are noticed for Eu_(2)MgWO_(6)and Eu_(2)ZnWO_(6),respectively,showing half-metallic behavior.The examination of the magnetic properties shows a significant magnetic moment of 14μ_(B)for Eu_(2)XWO_(6)(X=Mg,Zn).High optical conductivity and absorption are noticed in the UV region as shown by the optical traits of Eu_(2)XWO_(6)(X=Mg,Zn).Both materials show high magnetic moments,which leads to high spin polarization and are considered highly effective for the functioning of spintronic devices.
基金supported by the National Natural Science Foundation of China(Nos.21925302,92250306)the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB0450202)+1 种基金the Innovation Program for Quantum Science and Technology(2021ZD0303303)the National Key Research and Development Program of China(2018YFA0208702).
文摘Phonon coherence can reflect electron‒phonon coupling information and has been proven to modulate electronic states and charge transport.The manipulation of phonon coherence through spacer cation engineering in organic‒inorganic hybrid perovskites(OIHPs)has been extensively demonstrated;however,the underlying structural origin remains elusive at the molecular level.Herein,we present molecular structure and temperature-dependent coherent phonon studies via a combination of sum frequency generation vibrational spectroscopy(SFG-VS)and transient absorption spectroscopy(TAS).The conformational order of spacer cations dictates the coherent phonon oscillations in 2D OIHPs.Our study further analyzes the static order and dynamic disorder in 2D perovskites.This work provides molecular-level insights into the role of spacer cations in tuning structural order and may provide valuable guidance for advancing emergent optoelecltronics development.
基金financially supported by the Ph.D. start-up funds of Jiangxi Science and Technology Normal University (Nos. 2023BSQD11, 2023BSQD13)Jiangxi Province Key Laboratory of Organic Functional Molecules (No. 2024SSY05141)。
文摘The exploitation of organic-inorganic hybrid perovskites(OIHPs) as active layer materials for typical sandwich-structured resistive memories has attracted widespread interest due to the property of low power consumption and fast switching. However, the inherent thermal instability of perovskites limits the application of OIHPs-based resistive memories under extreme conditions, while the infiuence of thermal effects on their resistance change characteristics remains unclear. Herein, a novel 2D <100>-oriented high-temperature resistant OIHP [(BIZ-H)_(2)(PbBr_(4))]n(BIZ = benzimidazole) is prepared as an active layer material to fabricate FTO/[(BIZ-H)_(2)(PbBr_(4))]n/Ag resistive memory with excellent thermal reproducibility and stability up to 120℃. The increase in temperature leads to a decrease in the PbBr_(6) octahedral distortion in the crystal structure, an increase in hydrogen bonding between the(BIZ-H)+cation and the(PbBr_(4))_(n)^(2n-)layer, and a shortening of the spacing of the inorganic layers, which is found to result in the creation and predominance of thermally activated traps with increasing temperature. This work provides a new direction for the next generation of OIHPs-based resistive memories with high-temperature tolerance.
基金the Research Grant of Kwangwoon University in 2024 and the National Research Foundation of Korea(RS-2023-00236572 and RS-2023-00212110)funded by the Korea government(MSIT)the project for Collabo R&D between Industry,University,and Research Institute(RS-2024-00414524)funded by Korea Ministry of SMEs and Startups.
文摘Quasi-two-dimensional(2D)perovskite embodies characteristics of both three-dimensional(3D)and 2D perovskites,achieving the superior external environment stability structure of 2D perovskites alongside the high efficiency of 3D perovskites.This effect is realized through critical structural modifications in device fabrication.Typically,perovskites have an octahedral structure,generally ABX3,where an organic ammonium cation(A’)participates in forming the perovskite structure,with A’_(n)(n=1 or 2)sandwiched between A_(n-1)B_(n)X_(3n+1)perovskite layers.Depending on whether A’is a monovalent or divalent cation,2D perovskites are classified into Ruddlesden-Popper perovskite or Dion-Jacobson perovskite,each generating different structures.Although each structure achieves similar effects,they incorporate distinct mechanisms in their formation.And according to these different structures,various properties appear,and additive and optimizing methods to increase the efficiency of 3D perovskites also exist in 2D perovskites.In this review,scientific understanding and engineering perspectives of the quasi-2D perovskite is investigated,and the optimal structure quasi-2D and the device optimization is also discussed to provide the insight in the field.
文摘Photodetectors with weak-light detection capabilities play an indispensable role in various crucial fields such as health monitors,imaging,optical communication,and etc.Nevertheless,the detection of weak light signals is often severely interfered by multiple factors such as background light,dark noise and circuit noise,making it difficult to accurately capture signals.While traditional technologies like silicon photomultiplier tubes excel in sensitivity,their high cost and inherent fragility restrict their widespread application.Against this background,perovskite materials have rapidly emerged as a research focus in the field of photodetection due to their simple preparation processes and exceptional optoelectronic properties.Not only are the preparation processes of perovskite materials straightforward and cost-effective,but more importantly,they can be flexibly integrated into flexible and stretchable substrates.This characteristic significantly compensates for the shortcomings of traditional rigid electronic devices in specific application scenarios,opening up entirely new possibilities for photodetection technology.Herein,recent advances in perovskite light detection technology are reviewed.Firstly,the chemical and physical properties of perovskite materials are discussed,highlighting their remarkable advantages in weak-light detection.Subsequently,the review systematically organizes various preparation techniques of perovskite materials and analyses their advantages in different application scenarios.Meanwhile,from the two core dimensions of performance improvement and light absorption enhancement,the key strategies of improving the performance of perovskite weak-light photodetectors are explored.Finally,the review concludes with a brief summary and a discussion on the potential challenges that may arise in the further development of perovskite devices.
基金supported by the Nation Key R&D Program of China(Grant Numbers:2023YFC3906103)the Natural Science Foundation of Hunan Province(No.2022JJ30757)+1 种基金Entrepreneurship Research Team Project(No.1053320220430)Guangdong Science and Technology Planning Project(2018B030323010).
文摘Generally,referring to the stability of perovskite,the most studied perovskite material has been MA-free mixed-cationperovskite.The precise role of MA in the light-thermal-humid stability of perovskite solar cells still lacks ofa systematically understanding.In this work,the evolution of crystallographic structures,intermediate phase,ultrafast dynamics,and thermal decomposition behavior of MA-mixed perovskite FA_(1-x)MA_(x)PbI_(3)(x=0–100%)areinvestigated.The influence of MA on the stability of devices under heat,light,and humidity exposure arerevealed.In the investigated compositional space(x=0–100%),device efficiencies vary from 19.5%to 22.8%,andthe light,thermal,and humidity exposure stability of the related devices are obviously improved forFA1-xMAxPbI_(3)(x=20%–30%).Incorporation 20%–30%of MA cations lowers nucleation barrier and causes asignificant volume shrinkage,which enhances the interaction between FA and I,thus improving crystallizationand stability of the FA_(1-x)MA_(x)PbI_(3).Thermal behavior analysis reveals that the decomposition temperature of FA_(0.8)MA_(0.2)PbI_(3)reaches 247℃(FAPbI_(3),233℃)and trace amounts of MA cations enhance the thermal stability ofthe perovskite.Remarkably,we observe lattice shrinkage using spherical aberration corrected transmissionelectron microscope(AC-TEM).This work implies that stabilizing perovskites will be realized by incorporatingtrace amounts of MA,which improve the crystallization and carrier transport,leading to improved stability andperformances.
基金supported by the National Natural Science Foundation of China(22272065)the Natural Science Foundation of Jiangsu Province(BK20211530)+1 种基金the Fundamental Research Funds for the Central Universities(JUSRP62218)the Key Research and Development Special Project of Yi'chun City,Jiangxi Province,China(2023ZDYFZX06).
文摘One-dimensional perovskites possess unique photoelectric properties that distinguish them from other perovskitetypes, making them a focal point in photoelectric research. In recent years, there has been a significant surge ininterest surrounding the synthesis and application of one-dimensional anisotropic perovskites, spurred by ad-vancementsin synthesis techniques and notable breakthroughs in novel methodologies and application proper-ties.This article provides a comprehensive review of the progress made in research on one-dimensionalanisotropic perovskites, detailing the synthesis mechanisms and potential pathways for performance enhance-mentin various applications. We highlight the crucial role of controllable synthesis and heterogeneous effect intailoring perovskite properties to boost application efficacy. Initially, this review examines the primary synthesismethods and mechanisms for creating heterogeneously induced one-dimensional anisotropic perovskites, cate-gorizingthem into two main approaches: the classical wet chemical synthesis, which utilizes selective ligands, andthe ligand-free, substrate-assisted method. The precision in controllable synthesis is essential for fabricatingheterogeneous structures, where the synthesized precursor, shape, and surface ligand significantly influence theinterfacial strength of the heterogenic interface. We also discuss the key features that must be improved for high-performanceapplications, exploring how heterogeneous effects can enhance performance and drive the devel-opmentof heterogeneous devices in various applications, such as photodetectors, solar cells, light-emitting di-odes,and photocatalysis. Conclusively, by highlighting the emerging potential and promising opportunitiesoffered by strategic heterogeneous construction, we forecast a dynamic and transformative future for their pro-ductionand application landscapes.
基金financially supported by the National Natural Science Foundation of China(Nos.62205011,52473305,92256202,and 12261131500)the Fundamental Research Funds for the Central Universities(No.PY2507)Qian Xuesen Youth Innovation Fund of CASC
文摘Linearly polarized photodetectors(PDs),leveraging the inherent structural and material information encoded in light's polarization state,hold transformative potential for applications ranging from remote sensing to biomedical imaging.Traditional systems that rely on external polarizing elements face challenges in miniaturization and efficiency,driving interest in materials with intrinsic anisotropy.Low-dimensional metal halide perovskites,distinguished by their tunable bandgaps,high carrier mobility,and quantum confinement effects,have emerged as a groundbreaking platform for next-generation polarized PDs.This review comprehensively summarizes the theory,materials,and device engineering of linearly polarized PDs based on low-dimensional perovskites.It aims to elucidate polarization mechanisms across dimensions by establishing a rigorous theoretical foundation for linearly polarized PDs of low-dimensional perovskites.Beyond theoretical insights,the review also highlights cutting-edge fabrication techniques for one-dimensional nano wires and two-dimensional heterostructures,along with performance benchmarks of state-of-the-art devices.By integrating experimental advancements with theoretical insights,this work not only advances the fundamental understanding of polarization mechanisms but also outlines actionable pathways for optimizing device performance,stability,and scalability,which may serve as a critical resource for researchers aiming to harness the full potential of low-dimensional perovskites in polarized optoelectronics.
基金funded by the Jinan Central Hospital Collaboration(1190022050)Foundation for Innovative Research Groups of the National Natural Science Foundation of China(22205233,62374103,62374104,and 62405165)+3 种基金Basic and Applied Basic Research Foundation of Guangdong Province(2024A1515010926)Taishan Scholar Foundation of Shandong Province of Shandong Province(tsqn202312005)Postdoctoral Innovative Projects of Shandong Province(202400321)China Postdoctoral Science Foundation(2024M751789)。
文摘Cd-based Cs_(7)Cd_(3)Br_(13)perovskites,featuring both tetrahedral and octahedral polyhedral structures,have garnered significant acclaim for their efficient luminescent performance achieved through multi-exciton state regulation by doping.However,it remains controversial whether the doping sites are in the octahedra or tetrahedra of Cs_(7)Cd_(3)Br_(13).To address this,we introduced Pb^(2+)and Sb^(3+)ions and,supported by experimental and theoretical evidence,demonstrated that these ions preferentially occupy the octahedra.Among them,Pb^(2+)ions single doping achieves a near-unity photoluminescence quantum yield of 93.7%,which results in excellent X-ray scintillation performance,high light yield of 41,772 photon MeV^(-1),and a low detection limit of 29.78 nGyairs-1.Moreover,this incorporation of Pb^(2+)and Sb^(3+)enabled an exciton state regulation strategy,resulting in standard white light emission with CIE chromaticity coordinates of(0.33,0.33).Additionally,a multifaceted optical anticounterfeiting and information encryption scheme was designed based on the differences in optical properties caused by the different sensitivities of[PbBr6]4-octahedron and[SbBr6]3-octahedron to temperature and excitation wavelengths.These diverse photoluminescence characteristics provide new insights and practical demonstrations for advanced X-ray imaging,lighting,optical encryption,and anticounterfeiting technologies.
基金supported by the National Key Research and Development Program of China(No.2021YFB3502200)the National Natural Science Foundation of China(Nos.52172216 and 92163212)+1 种基金support from the Shanghai Engi-neering Research Center for Integrated Circuits and Advanced Dis-play Materialssupported by Shanghai Techni-cal Service Center of Science and Engineering Computing,Shanghai University and Hefei Advanced Computing Center.
文摘In past decades,ABX_(3) halide perovskites have attracted great interest in solar cells due to excellent opto-electronic properties,such as high carrier mobility.However,instability and toxicity are obstacles on the commercial route for perovskites.Many studies have turned to exploring A_(2) BX_(6) and A_(3) B_(2) X_(9) for better stability.Unfortunately,the carrier mobilities of these two types are inferior to ABX_(3),lower by an order of magnitude.Furthermore,the mobility of ABX_(3) is distributed over a large range of 1.78-4500 cm^(2) V^(−1) s^(−1) in experiments,which contributes to another diversity of mobilities.In this paper,we aim at reveal-ing the physical origin of the above-mentioned diversities by theoretical studies on CsBX_(3),Cs_(2) BX_(6),and Cs_(3) B_(2) X_(9)(B=Sn,Pb,Sb,Bi,X=Br,Cl).The difference in group velocities is the major reason responsible for the variation in these types.The unique three-dimensional connected conductive network of CsBX_(3) determines its large group velocity.As for carrier scattering,ionized impurity scattering dominates at low carrier and high ionized impurity concentrations.Detailed analysis reveals that band degeneracy is strongly related to the impurity scattering rate,while dielectric constant is almost immune.Our study provides a better understanding of the relationship between electronic structures and mobilities for po-tential applications in photovoltaics.
文摘A conventional solid-state process was used to synthesize the double perovskite materials HoRCoMnO_(6)(R=Ho,Gd,Eu,Nd).The structural properties of the compounds were investigated using X-ray powder diffraction(XRD).The results revealed that Ho_(2)CoMnO_(6) crystallizes in a monoclinic structure with the P2_(1)/n space group.In contrast,the other compounds HoRCoMnO_(6)(R=Gd,Eu,or Nd) exhibit an orthorhombic structure with the Pnma space group.As a result,the average crystallite size also changes as a function of rare-earth element doping.This investigation reveals that the magnetic properties of the compounds studied are significantly dependent on the doping elements.The Curie temperature T_C,for example,increases from 80 to 118℃ with the ionic radii of rare earths increasing.Furthermore,the study of the magnetocaloric effect(MCE) shows that the maximum of the entropy variation(-ΔS_(M)^(max)) increases from 4.97 to 6.06 J/(kg·K) under a magnetic field of 5 T with substitution by rare-earth ions.To examine the efficiency of MCE materials,the relative cooling power(RCP) was evaluated and is found to increase with increment of rare-earth radius till 406.69 J/kg for Nd.The mean entropy variation with tempe rature(TEC) was also studied.Due to their significant magnetocaloric performance,HoRCoMnO_(6)(noted as HRCMO) compounds(with R=Ho,Gd,Eu or Nd) could be good candidates for low-temperature magnetic cooling applications.
基金supported by the National Natural Science Foundation of China (21903012)
文摘Recently,organic-inorganic halide perovskite has received much attention because of its low cost and high efficiency in solar cells.Herein,we have performed the first-principles investigation to explore the structure,stability,electronic properties,and optical properties of AZBI_(3)(B=Pb,Sn,Ge)and AZSnI_(3−y)Br_(y)(y=1,2,3)perovskites.The tolerance factor(τ),octahedral factor(μ),and formation energies were calculated to evaluate the structural thermodynamic stability of six perovskites.The band gap and structures have been obtained,indicating that Sn/Ge replacement and Br-doping decrease the band gap.Similarly,B-site replacement and X-site doping affect the optical properties.All the absorption spectra of six perovskites cover the visible light region,and AZSnI_(3)/AZSnI2Br perovskites are the most outstanding.They are likely to be good candidates for use in solar cells.
