Two-dimensional Dion-Jacobson(DJ)perovskite has garnered significant attention due to its superior responsivity and operation stability.However,efforts are predominantly focused on discovering new organic spacer to sy...Two-dimensional Dion-Jacobson(DJ)perovskite has garnered significant attention due to its superior responsivity and operation stability.However,efforts are predominantly focused on discovering new organic spacer to synthesize novel perovskites,while material-form-associated light management,which is crucial for enhancing the photodetector’s efficiency,is largely overlooked.Herein,we introduced surface light management strategy into DJ-type perovskite system by synthesizing surface-patterned BDAPbBr4(BPB,BDA=NH_(3)(CH_(2))_(4)NH_(3))microplates(MPs)using template-assisted space-confined method,which was further elucidated by theoretical optical simulation.By leveraging surface-patterned MPs to enhance light absorption,the BPB-based photodetectors(PDs)achieved remarkable photoresponse in ultraviolet region,marked by a high on/off ratio(~5000),superior responsivity(2.24 A W^(-1)),along with large detectivity(~10^(13) Jones)and low detection limit(68.7 nW cm^(-2)).Additionally,the PDs showcased superior light communication and imaging capabilities even under weak-light illumination.Notably,the anisotropic nature of the surface-patterned MPs conferred excellent polarization sensitivity to the PD.These results represented the first demonstration of BPB perovskite in weak-light communication and imaging,as well as in polarized light detection.Our findings offer valuable insights into enhancing photodetector performance and optoelectronic applications through surface light management strategies.展开更多
Neuromorphic computing systems can perform memory and computing tasks in parallel on artificial synaptic devices through simulating synaptic functions,which is promising for breaking the conventional von Neumann bottl...Neuromorphic computing systems can perform memory and computing tasks in parallel on artificial synaptic devices through simulating synaptic functions,which is promising for breaking the conventional von Neumann bottlenecks at hardware level.Artificial optoelectronic synapses enable the synergistic coupling between optical and electrical signals in synaptic modulation,which opens up an innovative path for effective neuromorphic systems.With the advantages of high mobility,optical transparency,ultrawideband tunability,and environmental stability,graphene has attracted tremendous interest for electronic and optoelectronic applications.Recent progress highlights the significance of implementing graphene into artificial synaptic devices.Herein,to better understand the potential of graphene-based synaptic devices,the fabrication technologies of graphene are first presented.Then,the roles of graphene in various synaptic devices are demonstrated.Furthermore,their typical optoelectronic applications in neuromorphic systems are reviewed.Finally,outlooks for development of synaptic devices based on graphene are proposed.This review will provide a comprehensive understanding of graphene fabrication technologies and graphene-based synaptic device for optoelectronic applications,also present an outlook for development of graphene-based synaptic device in future neuromorphic systems.展开更多
Metal halide perovskite nanostructures have emerged as low-dimensional semiconductors of great significance in many fields such as photovoltaics,photonics,and optoelectronics.Extensive efforts on the controlled synthe...Metal halide perovskite nanostructures have emerged as low-dimensional semiconductors of great significance in many fields such as photovoltaics,photonics,and optoelectronics.Extensive efforts on the controlled synthesis of perovskite nanostructures have been made towards potential device applications.The engineering of their band structures holds great promise in the rational tuning of the electronic and optical properties of perovskite nanostructures,which is one of the keys to achieving efficient and multifunctional optoelectronic devices.In this article,we summarize recent advances in band structure engineering of perovskite nanostructures.A survey of bandgap engineering of nanostructured perovskites is firstly presented from the aspects of dimensionality tailoring,compositional substitution,phase segregation and transition,as well as strain and pressure stimuli.The strategies of electronic doping are then reviewed,including defect-induced self-doping,inorganic or organic molecules-based chemical doping,and modification by metal ions or nanostructures.Based on the bandgap engineering and electronic doping,discussions on engineering energy band alignments in perovskite nanostructures are provided for building high-performance perovskite p-n junctions and heterostructures.At last,we provide our perspectives in engineering band structures of perovskite nanostructures towards future low-energy optoelectronics technologies.展开更多
Quasi-two-dimensional(quasi-2D)metal halide perovskite(MHP)ferroelectrics,characterized by spontaneous polarization and semiconducting properties,hold promise for functional photoferroelectrics in applications such as...Quasi-two-dimensional(quasi-2D)metal halide perovskite(MHP)ferroelectrics,characterized by spontaneous polarization and semiconducting properties,hold promise for functional photoferroelectrics in applications such as optical storage and in-memory computing.However,typical quasi-2D perovskite films contain multiple quantum wells with random width distribution,which degrade optoelectronic properties and spontaneous polarization.Here,we introduce phase-pure quantum wells with uniform well width by incorporating the inorganic salt MnBr_(2),which effectively controls crystallization kinetics and restricts the nucleation of high n-phases,producing high-quality films.The resulting(BA)_(2)CsPb_(2)Br_(7)(BA=C_(4)H_(9)NH_(3))film demonstrates ferroelectric hysteresis behavior,clear in-plane ferroelectric domain switching,and a high photoluminescence quantum efficiency(PLQE)of 88.7%.Significantly,we observed a nonvolatile,reversible in situ photoluminescence(PL)modulation of Mn^(2+)in this ferroelectric MHP film under an applied electric field,attributed to lattice distortion from ferroelectric polarization orientation.These findings enabled the development of a simple system comprising gallium nitride(GaN)light emitting diodes(LEDs)and ferroelectric films to implement multi-state signal encoding and a logic AND gate.This work advances the fabrication of efficient ferroelectric MHP films and highlights their potential for advanced optoelectronic applications.展开更多
Metal halides have attracted worldwide attention as exceptional optoelectronic materials.Over the past decade,research on metal halides has yielded remarkable progress,and their color-conversion applications have show...Metal halides have attracted worldwide attention as exceptional optoelectronic materials.Over the past decade,research on metal halides has yielded remarkable progress,and their color-conversion applications have shown considerable promise for commercialization.With the reporting of self-trapped exciton(STE)emission in perovskites,the application of metal halides as broadband emitting materials in the lighting field has gained increas-ing interest.Herein,we provide a comprehensive review of metal halide STE emitters,especially for lighting applications.We begin with highlighting the ideal spectral characteristics and corresponding performance metrics for lighting.This is followed by a systematic summary of the mechanisms,optimization strategies,and recent advances of STE emission in metal halides.Finally,we outline the major challenges and prospective trends for metal halide STE emitters.This review aims to offer valuable insights into metal halide STE emitters and their lighting applications for facilitating the future commercialization.展开更多
Semiconductor perovskite films are now being widely investigated as light harvesters in solar cells with ever-increasing power conversion efficiencies,which have motivated the fabrication of other optoelectronic devic...Semiconductor perovskite films are now being widely investigated as light harvesters in solar cells with ever-increasing power conversion efficiencies,which have motivated the fabrication of other optoelectronic devices,such as light-emitting diodes,lasers,and photodetectors.Their superior material and optical properties are shared by the counterpart colloidal nanocrystals(NCs),with the additional advantage of quantum confinement that can yield size-dependent optical emission ranging from the near-UV to near-infrared wavelengths.So far,intensive research efforts have been devoted to the optical characterization of perovskite NC ensembles,revealing not only fundamental exciton relaxation and recombination dynamics but also lowthreshold amplified spontaneous emission and novel superfluorescence effects.Meanwhile,the application of single-particle spectroscopy techniques to perovskite NCs has helped to resolve a variety of optical properties for which there are few equivalents in traditional colloidal NCs,mainly including nonblinking photoluminescence,suppressed spectral diffusion,stable exciton fine structures,and coherent singlephoton emission.While the main purpose of ensemble optical studies is to guide the smooth development of perovskite NCs in classical optoelectronic applications,the rich observations from single-particle optical studies mark the emergence of a potential platform that can be exploited for quantum information technologies.展开更多
The rapid development of the semiconductor industry has motivated researchers passion for accelerating the discovery of advanced optoelectronic materials.Computational functionality-driven design is an emerging branch...The rapid development of the semiconductor industry has motivated researchers passion for accelerating the discovery of advanced optoelectronic materials.Computational functionality-driven design is an emerging branch of material science that has become effective at making material predictions.By combining advanced solid-state knowledge and high-throughput firstprinciples computational approaches with intelligent algorithms plus database development,experts can now efficiently explore many novel materials by taking advantage of the power of supercomputer architectures.Here,we discuss a set of typical design strategies that can be used to accelerate inorganic optoelectronic materials discovery from computer simulations:In silico computational screening;knowledge-based inverse design;and algorithm-based searching.A few representative examples in optoelectronic materials design are discussed to illustrate these computational functionality-driven modalities.Challenges and prospects for the computational functionality-driven design of materials are further highlighted at the end of the review.展开更多
Silicon-based semiconductor technology has made great breakthroughs in the past few decades,but it is reaching the physical limits of Moore’s law.In recent years,the presence of two-dimensional(2 D)materials was rega...Silicon-based semiconductor technology has made great breakthroughs in the past few decades,but it is reaching the physical limits of Moore’s law.In recent years,the presence of two-dimensional(2 D)materials was regarded as an opportunity to break the limitation of traditional siliconbased optoelectronic devices owing to their special structure and superior properties.In consideration of the widely studied hybrid integration of 2 D material detectors and 3 D siliconbased systems,in this paper,the basic properties of several 2 D materials used in photodetectors are summarized.Subsequently,the progress in silicon photonic integrated photodetectors based on 2 D materials is reviewed,followed by the summarization of the device structure and main performances.Then,the combination of some other traditional and2 D devices is discussed as a supplement.Finally,the prospective development of the hybrid 2 D/3 D silicon-based heterostructures is expected.展开更多
A quantum-chemical investigation on the structural and optoelectronic properties of two materials based on carbazole is carried out.The purpose is to display the effect of grafting the fluorine atoms on their optoelec...A quantum-chemical investigation on the structural and optoelectronic properties of two materials based on carbazole is carried out.The purpose is to display the effect of grafting the fluorine atoms on their optoelectronic and physico-chemical properties.In addition to solubility in the polar solvents and the modification in geometric parameters,the substitution of fluorine destabilizes the HOMO and LUMO levels,decreases the band gap energy and raises conjugation length.These properties suggest the substituted fluorine compound as a good candidate for optoelectronic applications.展开更多
Single crystal is the most advantageous of the crystalline states of halide perovskites.It displays better optical and electrical capabilities than polycrystalline films and microcrystals due to their inherent structu...Single crystal is the most advantageous of the crystalline states of halide perovskites.It displays better optical and electrical capabilities than polycrystalline films and microcrystals due to their inherent structural advantages,such as free grain boundaries,long-range ordered structure,and high orientation.Single-crystal perovskite materials can theoretically enable optoelectronic devices with higher performance and stronger stability.In this review,the intrinsic physical properties of perovskite single crystals are analyzed.The most recent advances in single-crystal optoelectronic devices are reviewed,and the design principles of the devices under different application conditions are revealed.It provides potential solutions for remaining challenges,and it is expected to accelerate the development of perovskite based optoelectronic devices.展开更多
The discovery and synthesis of colloidal quantum dots(QDs)were awarded the 2023 Nobel Prize in Chemistry.QDs,as a novel class of materials distinct from traditional molecular materials and bulk materials,have rapidly ...The discovery and synthesis of colloidal quantum dots(QDs)were awarded the 2023 Nobel Prize in Chemistry.QDs,as a novel class of materials distinct from traditional molecular materials and bulk materials,have rapidly emerged in the field of optoelectronic applications due to their unique size-,composition-,surface-,and process-dependent optoelectronic properties.More importantly,their ultra-high specific surface area allows for the application of various surface chemical engineering techniques to regulate and optimize their optoelectronic performance.Furthermore,three-dimensionally confined QDs can achieve nearly perfect photoluminescence quantum yields and extended hot carrier cooling times.Particularly,their ability to be colloidally synthesized and processed using industrially friendly solvents is driving transformative changes in the fields of electronics,photonics,and optoelectronics.展开更多
The synthesis of colloidal telluride semiconductor nanocrystals(CT-SNCs)is more challenging than that of chalcogenides,due to the smaller electron affinity of tellurium than that of sulfur and selenium,which is attrib...The synthesis of colloidal telluride semiconductor nanocrystals(CT-SNCs)is more challenging than that of chalcogenides,due to the smaller electron affinity of tellurium than that of sulfur and selenium,which is attributed to its metalloid property.While some new potential strategies were developing with the increasing demand of CT-SNCs,the cation exchange reaction(CER)has particularly become a new strategy to synthesize highquality CT-SNCs and their corresponded hetero-nanostructures.This review summarizes the synthesis strategies of CT-SNCs,including traditional methods and new methods with emphasis on CERs,and their resulting CTSNCs with well-controlling size,shape,composition,crystallization and hetero-interfaces cooperatively.The progressive synthesis methods give rise to the excellent optical properties of CT-SNCs.This review also covers the recent progress of their applications in the field of photoelectric detection,catalysis,batteries and biology.The new hybrid CT-SNCs nanostructures are also emphasized and systematically discussed due to their enhanced properties.展开更多
Two-dimensional(2D) layered perovskites have emerged as potential alternates to traditional three-dimensional(3D)analogs to solve the stability issue of perovskite solar cells. In recent years, many efforts have been ...Two-dimensional(2D) layered perovskites have emerged as potential alternates to traditional three-dimensional(3D)analogs to solve the stability issue of perovskite solar cells. In recent years, many efforts have been spent on manipulating the interlayer organic spacing cation to improve the photovoltaic properties of Dion–Jacobson(DJ) perovskites. In this work, a serious of cycloalkane(CA) molecules were selected as the organic spacing cation in 2D DJ perovskites, which can widely manipulate the optoelectronic properties of the DJ perovskites. The underlying relationship between the CA interlayer molecules and the crystal structures, thermodynamic stabilities, and electronic properties of 58 DJ perovskites has been investigated by using automatic high-throughput workflow cooperated with density-functional(DFT) calculations.We found that these CA-based DJ perovskites are all thermodynamic stable. The sizes of the cycloalkane molecules can influence the degree of inorganic framework distortion and further tune the bandgaps with a wide range of 0.9–2.1 eV.These findings indicate the cycloalkane molecules are suitable as spacing cation in 2D DJ perovskites and provide a useful guidance in designing novel 2D DJ perovskites for optoelectronic applications.展开更多
Thework presents the electronic structure computations and optical spectroscopy studies of half-Heusler ScNiBi and YNiBi compounds.Our first-principles computations of the electronic structures were based on density f...Thework presents the electronic structure computations and optical spectroscopy studies of half-Heusler ScNiBi and YNiBi compounds.Our first-principles computations of the electronic structures were based on density functional theory accounting for spin-orbit coupling.These compounds are computed to be semiconductors.The calculated gap values make ScNiBi and YNiBi valid for thermoelectric and optoelectronic applications and as selective filters.In ScNiBi and YNiBi,an intense peak at the energy of−2 eV is composed of theNi 3d states in the conduction band,and the valence band mostly contains these states with some contributions from the Bi 6p and Sc 3d or Y 4d electronic states.These states participate in the formation of the indirect gap of 0.16 eV(ScNiBi)and 0.18 eV(YNiBi).Within the spectral ellipsometry technique in the interval 0.22–15μm of wavelength,the optical functions of materials are studied,and their dispersion features are revealed.A good matching of the experimental and modeled optical conductivity spectra allowed us to analyze orbital contributions.The abnormally low optical absorption observed in the low-energy region of the spectrum is referred to as the results of band calculations indicating a small density of electronic states near the Fermi energy of these complex materials.展开更多
Two-dimensional(2D)transition metal dichalcogenides(TMDs),endowed with exceptional light-matter interaction strength,have become a pivotal platform in advanced optoelectronics,enabling atomically precise control of ex...Two-dimensional(2D)transition metal dichalcogenides(TMDs),endowed with exceptional light-matter interaction strength,have become a pivotal platform in advanced optoelectronics,enabling atomically precise control of excitonic phenomena and offering transformative potential for engineering next-generation optoelectronic devices.In contrast to the narrowband absorption characteristics of conventional band-edge excitons,which are limited by the bandgap energy,highenergy excitons not only demonstrate broad momentum matching capability in the ultraviolet regime due to band nesting effects,but also exhibit distinct absorption peak signatures owing to robust excitonic stabilization under 2D confinement.These unique photophysical properties have established such systems as a prominent research frontier in contemporary exciton physics.This review primarily outlines the distinctive physical characteristics of high-energy excitons in TMDs from the perspectives of band structure,excitonic characteristics,and optical properties.Subsequently,we systematically delineate cutting-edge developments in TMD-based photonic devices exploiting high-energy excitonic band-nesting phenomena,with dedicated emphasis on the strategic engineering of nanoscale heterostructures for tailored optoelectronic functionality.Finally,the discussion concludes with an examination of the challenges associated with the design of high-energy exciton devices and their potential future applications.展开更多
Since two-dimensional （2D） graphene was fabricated successfully, many kinds of graphene-like 2D materials have attracted extensive attention. Among them, the studies of 2D metal chalcogenides have become the focus o...Since two-dimensional （2D） graphene was fabricated successfully, many kinds of graphene-like 2D materials have attracted extensive attention. Among them, the studies of 2D metal chalcogenides have become the focus of intense research due to their unique physical properties and promising applications. Here, we review significant recent advances in optoelectronic properties and applications of 2D metal chalcogenides. This review highlights the recent progress of synthesis, characterization and isolation of single and few layer metal chalco- genides nanosheets. Moreover, we also focus on the recent important progress of electronic, optical properties and optoelectronic devices of 2D metal chalcogenides. Additionally, the theoretical model and understanding on the band structures, optical properties and related physical mechanism are also reviewed. Finally, we give some per- sonal perspectives on potential research problems in the optoelectronic characteristics of 2D metal chalcogenides and related device applications.展开更多
Halide perovskites are considered as promising memristive materials for nextgeneration optoelectronic devices.This review concisely summarizes the recent development of halide perovskite memristors and highlights thei...Halide perovskites are considered as promising memristive materials for nextgeneration optoelectronic devices.This review concisely summarizes the recent development of halide perovskite memristors and highlights their advancements in optoelectronic applications:light‐induced low power switches,optoelectronic logic operations,optoelectronic neuromorphic computation,and artificial vision systems.Finally,we address the challenges and future development prospects of halide perovskites‐based memristors.This review highlights the promising potential of halide perovskite materials for future optoelectronic memory and computing applications.展开更多
Carbon dots(CDs)are a class of zero-dimensional carbon-based nanomaterials with a size of less than 10 nm and remarkable fluorescence properties[1].Owing to their excellent fluorescence characteristics,chemical stabil...Carbon dots(CDs)are a class of zero-dimensional carbon-based nanomaterials with a size of less than 10 nm and remarkable fluorescence properties[1].Owing to their excellent fluorescence characteristics,chemical stability,biocompatibility,and low toxicity,CDs show great potential in biomedical,catalytic,and optoelectronic applications[2],[3].Based on their formation mechanisms,micro/nano structures,and properties.展开更多
The two-dimensional（2D） perovskite（including pure-2D and quasi-2D） is formed by introducing large-group ammonium halides into conventional bulk perovskite. In the past twenty years, 2D perovskite materials were wi...The two-dimensional（2D） perovskite（including pure-2D and quasi-2D） is formed by introducing large-group ammonium halides into conventional bulk perovskite. In the past twenty years, 2D perovskite materials were widely developed with the enriched species and advanced physicalknowledge in material characteristics as well as optoelectronic device applications. To review achievments in 2D perovskite,the fundamental mechanism and properties of 2D perovskite are introduced to offer insight into device performance.Moreover, the preparation methods of 2D perovskite films are summarized and compared. The latest successful applications of the 2D perovskite in the solar cells and light-emitting diodes fields, especially the advanced stability of 2D perovskite solar cells（PeSCs） and the efficient 2D perovskite lightemitting diodes（PeLEDs）, are also achieved. Furthermore, the challenges and outlook of 2D perovskite materials are proposed.展开更多
The exponential growth of utilizing synthetic organic molecules in optoelectronic applications poses strong demands for rational control over the excited states of the materials. The manipulation of excited states thr...The exponential growth of utilizing synthetic organic molecules in optoelectronic applications poses strong demands for rational control over the excited states of the materials. The manipulation of excited states through molecular design has led to the development of high-performance optoelectronic devices with tunable emission colors, high quantum efficiencies and efficient energy/charge transfer processes. Recently, a significant breakthrough in lifetime tuning of excited states has been made;the purely organic molecules were found to have ultralonglived excited state under ambient conditions with luminescence lifetimes up to 1.35 s, which are several orders of magnitude longer than those of conventional organic fluorophores. Given the conceptual advance in understanding the fundamental behavior of excited state tuning in organic luminescent materials, the investigations of organic ultralong room-temperature phosphorescence(OURTP) should provide new directions for researches and have profound impacts on many different disciplines. Here, we summarized the recent understandings on the excited state tuning, the reported OURTP molecules and their design considerations,the spectacular photophysical performance, and the amazing optoelectronic applications of the newly emerged organic optoelectronic materials that free of heavy metals.展开更多
基金the Key Research and Development Program sponsored by the Ministry of Science and Technology of China(2024YFE0201800)the National Natural Science Foundation of China(Nos.12134010,12174290)the Natural Science Foundation of Hubei Province,China(Grant Nos.2023BAB102 and 2021CFB039).
文摘Two-dimensional Dion-Jacobson(DJ)perovskite has garnered significant attention due to its superior responsivity and operation stability.However,efforts are predominantly focused on discovering new organic spacer to synthesize novel perovskites,while material-form-associated light management,which is crucial for enhancing the photodetector’s efficiency,is largely overlooked.Herein,we introduced surface light management strategy into DJ-type perovskite system by synthesizing surface-patterned BDAPbBr4(BPB,BDA=NH_(3)(CH_(2))_(4)NH_(3))microplates(MPs)using template-assisted space-confined method,which was further elucidated by theoretical optical simulation.By leveraging surface-patterned MPs to enhance light absorption,the BPB-based photodetectors(PDs)achieved remarkable photoresponse in ultraviolet region,marked by a high on/off ratio(~5000),superior responsivity(2.24 A W^(-1)),along with large detectivity(~10^(13) Jones)and low detection limit(68.7 nW cm^(-2)).Additionally,the PDs showcased superior light communication and imaging capabilities even under weak-light illumination.Notably,the anisotropic nature of the surface-patterned MPs conferred excellent polarization sensitivity to the PD.These results represented the first demonstration of BPB perovskite in weak-light communication and imaging,as well as in polarized light detection.Our findings offer valuable insights into enhancing photodetector performance and optoelectronic applications through surface light management strategies.
基金the National Natural Science Foundation of China (Grant No. 61974093)Guangdong Basic and Applied Basic Research Foundation (Grant No. 2023A1515012479)+2 种基金Guangdong Provincial Department of Science and Technology (Grant No. 2020A1515110883)the Science and Technology Innovation Commission of Shenzhen (Grant Nos. RCYX20200714114524157 and JCYJ20220818100206013)NTUT-SZU Joint Research Program (Grant No. NTUT-SZU-112-02)
文摘Neuromorphic computing systems can perform memory and computing tasks in parallel on artificial synaptic devices through simulating synaptic functions,which is promising for breaking the conventional von Neumann bottlenecks at hardware level.Artificial optoelectronic synapses enable the synergistic coupling between optical and electrical signals in synaptic modulation,which opens up an innovative path for effective neuromorphic systems.With the advantages of high mobility,optical transparency,ultrawideband tunability,and environmental stability,graphene has attracted tremendous interest for electronic and optoelectronic applications.Recent progress highlights the significance of implementing graphene into artificial synaptic devices.Herein,to better understand the potential of graphene-based synaptic devices,the fabrication technologies of graphene are first presented.Then,the roles of graphene in various synaptic devices are demonstrated.Furthermore,their typical optoelectronic applications in neuromorphic systems are reviewed.Finally,outlooks for development of synaptic devices based on graphene are proposed.This review will provide a comprehensive understanding of graphene fabrication technologies and graphene-based synaptic device for optoelectronic applications,also present an outlook for development of graphene-based synaptic device in future neuromorphic systems.
基金support from Australian Research Council (ARC, FT150100450, IH150100006 and CE170100039)support from the MCATM and the FLEET+1 种基金the support from Shenzhen Nanshan District Pilotage Team Program (LHTD20170006)support from Guangzhou Science and Technology Program (Grant No. 201804010322)
文摘Metal halide perovskite nanostructures have emerged as low-dimensional semiconductors of great significance in many fields such as photovoltaics,photonics,and optoelectronics.Extensive efforts on the controlled synthesis of perovskite nanostructures have been made towards potential device applications.The engineering of their band structures holds great promise in the rational tuning of the electronic and optical properties of perovskite nanostructures,which is one of the keys to achieving efficient and multifunctional optoelectronic devices.In this article,we summarize recent advances in band structure engineering of perovskite nanostructures.A survey of bandgap engineering of nanostructured perovskites is firstly presented from the aspects of dimensionality tailoring,compositional substitution,phase segregation and transition,as well as strain and pressure stimuli.The strategies of electronic doping are then reviewed,including defect-induced self-doping,inorganic or organic molecules-based chemical doping,and modification by metal ions or nanostructures.Based on the bandgap engineering and electronic doping,discussions on engineering energy band alignments in perovskite nanostructures are provided for building high-performance perovskite p-n junctions and heterostructures.At last,we provide our perspectives in engineering band structures of perovskite nanostructures towards future low-energy optoelectronics technologies.
基金supported by the National Key R&D Program of China[2021YFA0715600]National Natural Science Foundation of China[62121005,62425408,U22A2084,62404221]+2 种基金Youth Innovation Promotion Association of CAS[2023223]Natural Science Foundation of Jilin Province[20230101345JC,20230101360JC,SKL202302026]Young Elite Scientist Sponsorship Program by CAST[YESS20200182]。
文摘Quasi-two-dimensional(quasi-2D)metal halide perovskite(MHP)ferroelectrics,characterized by spontaneous polarization and semiconducting properties,hold promise for functional photoferroelectrics in applications such as optical storage and in-memory computing.However,typical quasi-2D perovskite films contain multiple quantum wells with random width distribution,which degrade optoelectronic properties and spontaneous polarization.Here,we introduce phase-pure quantum wells with uniform well width by incorporating the inorganic salt MnBr_(2),which effectively controls crystallization kinetics and restricts the nucleation of high n-phases,producing high-quality films.The resulting(BA)_(2)CsPb_(2)Br_(7)(BA=C_(4)H_(9)NH_(3))film demonstrates ferroelectric hysteresis behavior,clear in-plane ferroelectric domain switching,and a high photoluminescence quantum efficiency(PLQE)of 88.7%.Significantly,we observed a nonvolatile,reversible in situ photoluminescence(PL)modulation of Mn^(2+)in this ferroelectric MHP film under an applied electric field,attributed to lattice distortion from ferroelectric polarization orientation.These findings enabled the development of a simple system comprising gallium nitride(GaN)light emitting diodes(LEDs)and ferroelectric films to implement multi-state signal encoding and a logic AND gate.This work advances the fabrication of efficient ferroelectric MHP films and highlights their potential for advanced optoelectronic applications.
文摘Metal halides have attracted worldwide attention as exceptional optoelectronic materials.Over the past decade,research on metal halides has yielded remarkable progress,and their color-conversion applications have shown considerable promise for commercialization.With the reporting of self-trapped exciton(STE)emission in perovskites,the application of metal halides as broadband emitting materials in the lighting field has gained increas-ing interest.Herein,we provide a comprehensive review of metal halide STE emitters,especially for lighting applications.We begin with highlighting the ideal spectral characteristics and corresponding performance metrics for lighting.This is followed by a systematic summary of the mechanisms,optimization strategies,and recent advances of STE emission in metal halides.Finally,we outline the major challenges and prospective trends for metal halide STE emitters.This review aims to offer valuable insights into metal halide STE emitters and their lighting applications for facilitating the future commercialization.
基金supported by the National Key R&D Program of China(Grant Nos.2019YFA0308700 and 2017YFA0303700)the National Natural Science Foundation of China(Grant Nos.61974058,11574147,and 11974164)the PAPD of Jiangsu Higher Education Institutions
文摘Semiconductor perovskite films are now being widely investigated as light harvesters in solar cells with ever-increasing power conversion efficiencies,which have motivated the fabrication of other optoelectronic devices,such as light-emitting diodes,lasers,and photodetectors.Their superior material and optical properties are shared by the counterpart colloidal nanocrystals(NCs),with the additional advantage of quantum confinement that can yield size-dependent optical emission ranging from the near-UV to near-infrared wavelengths.So far,intensive research efforts have been devoted to the optical characterization of perovskite NC ensembles,revealing not only fundamental exciton relaxation and recombination dynamics but also lowthreshold amplified spontaneous emission and novel superfluorescence effects.Meanwhile,the application of single-particle spectroscopy techniques to perovskite NCs has helped to resolve a variety of optical properties for which there are few equivalents in traditional colloidal NCs,mainly including nonblinking photoluminescence,suppressed spectral diffusion,stable exciton fine structures,and coherent singlephoton emission.While the main purpose of ensemble optical studies is to guide the smooth development of perovskite NCs in classical optoelectronic applications,the rich observations from single-particle optical studies mark the emergence of a potential platform that can be exploited for quantum information technologies.
基金Jilin Province Science and Technology Development Program,Grant/Award Number:20190201016JCNational Natural Science Foundation of China,Grant/Award Numbers:11674121,61722403+2 种基金supported by the National Natural Science Foundation of China(Grant No.61722403 and 11674121)Jilin Province Science and Technology Development Program(Grant No.20190201016JC)Program for Jilin University Science and Technology Innovative Research Team.J.Li gratefully acknowledges financial support from the“The Pearl River Talent Recruitment Program.”Z.Liu gives special thanks to the Research and Training Foundation for Young Teachers of South China Normal University.
文摘The rapid development of the semiconductor industry has motivated researchers passion for accelerating the discovery of advanced optoelectronic materials.Computational functionality-driven design is an emerging branch of material science that has become effective at making material predictions.By combining advanced solid-state knowledge and high-throughput firstprinciples computational approaches with intelligent algorithms plus database development,experts can now efficiently explore many novel materials by taking advantage of the power of supercomputer architectures.Here,we discuss a set of typical design strategies that can be used to accelerate inorganic optoelectronic materials discovery from computer simulations:In silico computational screening;knowledge-based inverse design;and algorithm-based searching.A few representative examples in optoelectronic materials design are discussed to illustrate these computational functionality-driven modalities.Challenges and prospects for the computational functionality-driven design of materials are further highlighted at the end of the review.
基金financially supported by the National Key Research and Development Program of China(2017YFA0207500)the National Natural Science Foundation of China(62125404)the CASJSPS Cooperative Research Project(GJHZ2021131)。
文摘Silicon-based semiconductor technology has made great breakthroughs in the past few decades,but it is reaching the physical limits of Moore’s law.In recent years,the presence of two-dimensional(2 D)materials was regarded as an opportunity to break the limitation of traditional siliconbased optoelectronic devices owing to their special structure and superior properties.In consideration of the widely studied hybrid integration of 2 D material detectors and 3 D siliconbased systems,in this paper,the basic properties of several 2 D materials used in photodetectors are summarized.Subsequently,the progress in silicon photonic integrated photodetectors based on 2 D materials is reviewed,followed by the summarization of the device structure and main performances.Then,the combination of some other traditional and2 D devices is discussed as a supplement.Finally,the prospective development of the hybrid 2 D/3 D silicon-based heterostructures is expected.
文摘A quantum-chemical investigation on the structural and optoelectronic properties of two materials based on carbazole is carried out.The purpose is to display the effect of grafting the fluorine atoms on their optoelectronic and physico-chemical properties.In addition to solubility in the polar solvents and the modification in geometric parameters,the substitution of fluorine destabilizes the HOMO and LUMO levels,decreases the band gap energy and raises conjugation length.These properties suggest the substituted fluorine compound as a good candidate for optoelectronic applications.
基金work was supported by the National Natural Science Foundation of China(52025028 and 52202273)the Natural Science Foundation of Jiangsu Province(BK20210728)Funded by the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institutions.
文摘Single crystal is the most advantageous of the crystalline states of halide perovskites.It displays better optical and electrical capabilities than polycrystalline films and microcrystals due to their inherent structural advantages,such as free grain boundaries,long-range ordered structure,and high orientation.Single-crystal perovskite materials can theoretically enable optoelectronic devices with higher performance and stronger stability.In this review,the intrinsic physical properties of perovskite single crystals are analyzed.The most recent advances in single-crystal optoelectronic devices are reviewed,and the design principles of the devices under different application conditions are revealed.It provides potential solutions for remaining challenges,and it is expected to accelerate the development of perovskite based optoelectronic devices.
文摘The discovery and synthesis of colloidal quantum dots(QDs)were awarded the 2023 Nobel Prize in Chemistry.QDs,as a novel class of materials distinct from traditional molecular materials and bulk materials,have rapidly emerged in the field of optoelectronic applications due to their unique size-,composition-,surface-,and process-dependent optoelectronic properties.More importantly,their ultra-high specific surface area allows for the application of various surface chemical engineering techniques to regulate and optimize their optoelectronic performance.Furthermore,three-dimensionally confined QDs can achieve nearly perfect photoluminescence quantum yields and extended hot carrier cooling times.Particularly,their ability to be colloidally synthesized and processed using industrially friendly solvents is driving transformative changes in the fields of electronics,photonics,and optoelectronics.
基金financially supported by the National Natural Science Foundation of China (Nos.22105116, 51872030,51631001,51702016,51902023 and 21801015)the Joint R&D Plan of Hong Kong,Macao,Taiwan and Beijing (No. Z191100001619002)+1 种基金the Fundamental Research Funds for the Central Universities (No.2017CX01003)Beijing Institute of Technology Research Fund Program for Young Scholars
文摘The synthesis of colloidal telluride semiconductor nanocrystals(CT-SNCs)is more challenging than that of chalcogenides,due to the smaller electron affinity of tellurium than that of sulfur and selenium,which is attributed to its metalloid property.While some new potential strategies were developing with the increasing demand of CT-SNCs,the cation exchange reaction(CER)has particularly become a new strategy to synthesize highquality CT-SNCs and their corresponded hetero-nanostructures.This review summarizes the synthesis strategies of CT-SNCs,including traditional methods and new methods with emphasis on CERs,and their resulting CTSNCs with well-controlling size,shape,composition,crystallization and hetero-interfaces cooperatively.The progressive synthesis methods give rise to the excellent optical properties of CT-SNCs.This review also covers the recent progress of their applications in the field of photoelectric detection,catalysis,batteries and biology.The new hybrid CT-SNCs nanostructures are also emphasized and systematically discussed due to their enhanced properties.
基金supported by the National Natural Science Foundation of China (Grant No. 62004080)the Postdoctoral Innovative Talents Supporting Program (Grant No. BX20190143)the China Postdoctoral Science Foundation (Grant No. 2020M670834)。
文摘Two-dimensional(2D) layered perovskites have emerged as potential alternates to traditional three-dimensional(3D)analogs to solve the stability issue of perovskite solar cells. In recent years, many efforts have been spent on manipulating the interlayer organic spacing cation to improve the photovoltaic properties of Dion–Jacobson(DJ) perovskites. In this work, a serious of cycloalkane(CA) molecules were selected as the organic spacing cation in 2D DJ perovskites, which can widely manipulate the optoelectronic properties of the DJ perovskites. The underlying relationship between the CA interlayer molecules and the crystal structures, thermodynamic stabilities, and electronic properties of 58 DJ perovskites has been investigated by using automatic high-throughput workflow cooperated with density-functional(DFT) calculations.We found that these CA-based DJ perovskites are all thermodynamic stable. The sizes of the cycloalkane molecules can influence the degree of inorganic framework distortion and further tune the bandgaps with a wide range of 0.9–2.1 eV.These findings indicate the cycloalkane molecules are suitable as spacing cation in 2D DJ perovskites and provide a useful guidance in designing novel 2D DJ perovskites for optoelectronic applications.
文摘Thework presents the electronic structure computations and optical spectroscopy studies of half-Heusler ScNiBi and YNiBi compounds.Our first-principles computations of the electronic structures were based on density functional theory accounting for spin-orbit coupling.These compounds are computed to be semiconductors.The calculated gap values make ScNiBi and YNiBi valid for thermoelectric and optoelectronic applications and as selective filters.In ScNiBi and YNiBi,an intense peak at the energy of−2 eV is composed of theNi 3d states in the conduction band,and the valence band mostly contains these states with some contributions from the Bi 6p and Sc 3d or Y 4d electronic states.These states participate in the formation of the indirect gap of 0.16 eV(ScNiBi)and 0.18 eV(YNiBi).Within the spectral ellipsometry technique in the interval 0.22–15μm of wavelength,the optical functions of materials are studied,and their dispersion features are revealed.A good matching of the experimental and modeled optical conductivity spectra allowed us to analyze orbital contributions.The abnormally low optical absorption observed in the low-energy region of the spectrum is referred to as the results of band calculations indicating a small density of electronic states near the Fermi energy of these complex materials.
基金Project supported by the National Natural Science Foundation Fund for Distinguished Young Scholars(Grant No.52025022)the National Natural Science Foundation of China(Grant Nos.62574038,12474421,62275045,and 12074060)+1 种基金the National Key R&D Program of China(Grant No.2023YFB3610200)the Fund from Jilin Province(Grant Nos.JJKH20241413KJ and 20240601049RC)。
文摘Two-dimensional(2D)transition metal dichalcogenides(TMDs),endowed with exceptional light-matter interaction strength,have become a pivotal platform in advanced optoelectronics,enabling atomically precise control of excitonic phenomena and offering transformative potential for engineering next-generation optoelectronic devices.In contrast to the narrowband absorption characteristics of conventional band-edge excitons,which are limited by the bandgap energy,highenergy excitons not only demonstrate broad momentum matching capability in the ultraviolet regime due to band nesting effects,but also exhibit distinct absorption peak signatures owing to robust excitonic stabilization under 2D confinement.These unique photophysical properties have established such systems as a prominent research frontier in contemporary exciton physics.This review primarily outlines the distinctive physical characteristics of high-energy excitons in TMDs from the perspectives of band structure,excitonic characteristics,and optical properties.Subsequently,we systematically delineate cutting-edge developments in TMD-based photonic devices exploiting high-energy excitonic band-nesting phenomena,with dedicated emphasis on the strategic engineering of nanoscale heterostructures for tailored optoelectronic functionality.Finally,the discussion concludes with an examination of the challenges associated with the design of high-energy exciton devices and their potential future applications.
文摘Since two-dimensional （2D） graphene was fabricated successfully, many kinds of graphene-like 2D materials have attracted extensive attention. Among them, the studies of 2D metal chalcogenides have become the focus of intense research due to their unique physical properties and promising applications. Here, we review significant recent advances in optoelectronic properties and applications of 2D metal chalcogenides. This review highlights the recent progress of synthesis, characterization and isolation of single and few layer metal chalco- genides nanosheets. Moreover, we also focus on the recent important progress of electronic, optical properties and optoelectronic devices of 2D metal chalcogenides. Additionally, the theoretical model and understanding on the band structures, optical properties and related physical mechanism are also reviewed. Finally, we give some per- sonal perspectives on potential research problems in the optoelectronic characteristics of 2D metal chalcogenides and related device applications.
基金Ministry of Science and Technology of the People's Republic of China,Grant/Award Number:2023YFB4402301the fund from Jilin Province,Grant/Award Number:20240101018JJ+3 种基金111 Project,Grant/Award Number:B13013Fundamental Research Funds for the Central Universities,Grant/Award Number:2412023YQ004NSFC for Distinguished Young Scholars,Grant/Award Number:52025022NSFC Program,Grant/Award Numbers:52272140,U23A20568。
文摘Halide perovskites are considered as promising memristive materials for nextgeneration optoelectronic devices.This review concisely summarizes the recent development of halide perovskite memristors and highlights their advancements in optoelectronic applications:light‐induced low power switches,optoelectronic logic operations,optoelectronic neuromorphic computation,and artificial vision systems.Finally,we address the challenges and future development prospects of halide perovskites‐based memristors.This review highlights the promising potential of halide perovskite materials for future optoelectronic memory and computing applications.
基金supported in part by the National Natural Science Foundation of China(U24A2079 and 82570162)the Natural Science Foundation of Henan Province(252300421125).
文摘Carbon dots(CDs)are a class of zero-dimensional carbon-based nanomaterials with a size of less than 10 nm and remarkable fluorescence properties[1].Owing to their excellent fluorescence characteristics,chemical stability,biocompatibility,and low toxicity,CDs show great potential in biomedical,catalytic,and optoelectronic applications[2],[3].Based on their formation mechanisms,micro/nano structures,and properties.
基金supported by the National Key Research and Development Program of China (2016YFA0202401)the 111 Project (B16016)+1 种基金the National Natural Science Foundation of China (51572080, 51702096 and U1705256)the Fundamental Research Funds for the Central Universities (2017XS080)
文摘The two-dimensional（2D） perovskite（including pure-2D and quasi-2D） is formed by introducing large-group ammonium halides into conventional bulk perovskite. In the past twenty years, 2D perovskite materials were widely developed with the enriched species and advanced physicalknowledge in material characteristics as well as optoelectronic device applications. To review achievments in 2D perovskite,the fundamental mechanism and properties of 2D perovskite are introduced to offer insight into device performance.Moreover, the preparation methods of 2D perovskite films are summarized and compared. The latest successful applications of the 2D perovskite in the solar cells and light-emitting diodes fields, especially the advanced stability of 2D perovskite solar cells（PeSCs） and the efficient 2D perovskite lightemitting diodes（PeLEDs）, are also achieved. Furthermore, the challenges and outlook of 2D perovskite materials are proposed.
基金supported in part by the National Natural Science Foundation of China(21274065,21304049,61204048 and 51173081)The Ministry of Education of China(IRT1148)+1 种基金a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(YX03001)the Qing Lan Project of Jiangsu Province
文摘The exponential growth of utilizing synthetic organic molecules in optoelectronic applications poses strong demands for rational control over the excited states of the materials. The manipulation of excited states through molecular design has led to the development of high-performance optoelectronic devices with tunable emission colors, high quantum efficiencies and efficient energy/charge transfer processes. Recently, a significant breakthrough in lifetime tuning of excited states has been made;the purely organic molecules were found to have ultralonglived excited state under ambient conditions with luminescence lifetimes up to 1.35 s, which are several orders of magnitude longer than those of conventional organic fluorophores. Given the conceptual advance in understanding the fundamental behavior of excited state tuning in organic luminescent materials, the investigations of organic ultralong room-temperature phosphorescence(OURTP) should provide new directions for researches and have profound impacts on many different disciplines. Here, we summarized the recent understandings on the excited state tuning, the reported OURTP molecules and their design considerations,the spectacular photophysical performance, and the amazing optoelectronic applications of the newly emerged organic optoelectronic materials that free of heavy metals.
