Properties of ferroelectric xBiInO3-（1-x）PbTiO3（xBI-（1-x）PT） thin films deposited on（101） SrRuO3/（200）Pt/（200） MgO substrates by rf magnetron sputtering method and effects of deposition conditions are inve...Properties of ferroelectric xBiInO3-（1-x）PbTiO3（xBI-（1-x）PT） thin films deposited on（101） SrRuO3/（200）Pt/（200） MgO substrates by rf magnetron sputtering method and effects of deposition conditions are investigated.The structures of the xBI-（1-x）PT films are characterized by x-ray diffraction and scanning electron microscopy.The results indicate that the thin films are grown with mainly（001） orientation. The chemical compositions of the films are analyzed by scanning electron probe and the results indicate that the loss phenomena of Pb and Bi elements depend on the pressure and temperature during the sputtering process.The sputtering parameters including target composition, substrate temperature, and gas pressure are adjusted to obtain optimum sputtering conditions. To decrease leakage currents,2 mol% La2 O3 is doped in the targets. The P-E hysteresis loops show that the optimized xBI-（1-x）PT（x = 0.24） film has high ferroelectricities with remnant polarization2 Pr = 80μC/cm2 and coercive electric field 2 EC = 300 kV/cm. The Curie temperature is about 640℃. The results show that the films have optimum performance and will have wide applications.展开更多
Chloride-based solid electrolytes are considered promising candidates for next-generation high-energy-density all-solid-state batteries(ASSBs).However,their relatively low oxidative decomposition threshold(~4.2 V vs.L...Chloride-based solid electrolytes are considered promising candidates for next-generation high-energy-density all-solid-state batteries(ASSBs).However,their relatively low oxidative decomposition threshold(~4.2 V vs.Li^(+)/Li)constrains their use in ultrahighvoltage systems(e.g.,4.8 V).In this work,ferroelectric Ba TiO_(3)(BTO)nanoparticles with optimized thickness of~50-100 nm were successfully coated onto Li_(2.5)Y_(0.5)Zr_(0.5)Cl_(6)(LYZC@5BTO)electrolytes using a time-efficient ball-milling process.The nanoparticle-induced interfacial ionic conduction enhancement mechanism contributed to the preservation of LYZC’s high ionic conductivity,which remained at 1.06 m S cm^(-1)for LYZC@5BTO.Furthermore,this surface electric field engineering strategy effectively mitigates the voltage-induced self-decomposition of chloride-based solid electrolytes,suppresses parasitic interfacial reactions with single-crystal NCM811(SCNCM811),and inhibits the irreversible phase transition of SCNCM811.Consequently,the cycling stability of LYZC under high-voltage conditions(4.8 V vs.Li+/Li)is significantly improved.Specifically,ASSB cells employing LYZC@5BTO exhibited a superior discharge capacity of 95.4 m Ah g^(-1)over 200 cycles at 1 C,way outperforming cell using pristine LYZC that only shows a capacity of 55.4 m Ah g^(-1).Furthermore,time-of-flight secondary ion mass spectrometry and X-ray photoelectron spectroscopy analysis revealed that Metal-O-Cl by-products from cumulative interfacial side reactions accounted for 6% of the surface species initially,rising to 26% after 200 cycles in pristine LYZC.In contrast,LYZC@5BTO limited this increase to only 14%,confirming the effectiveness of BTO in stabilizing the interfacial chemistry.This electric field modulation strategy offers a promising route toward the commercialization of high-voltage solid-state electrolytes and energy-dense ASSBs.展开更多
Photoresponsive memristors(i.e.,photomemristors)have been recently highly regarded to tackle data latency and energy consumption challenges in conventional Von Neumann architecture-based image recognition systems.Howe...Photoresponsive memristors(i.e.,photomemristors)have been recently highly regarded to tackle data latency and energy consumption challenges in conventional Von Neumann architecture-based image recognition systems.However,their efficacy in recognizing low-contrast images is quite limited,and while preprocessing algorithms are usually employed to enhance these images,which naturally introduce delays that hinder real-time recognition in complex conditions.To address this challenge,here we present a selfdriven polarization-sensitive ferroelectric photomemristor inspired by advanced biological systems.The proposed prototype device is engineered to extract image polarization information,enabling real-time and in-situ enhanced image recognition and classification capabilities.By combining the anisotropic optical feature of the two-dimensional material(ReSe_(2))and ferroelectric polarization of singlecrystalline diisopropylammonium bromide(DIPAB)thin film,tunable and self-driven polarized responsiveness with intelligence was achieved.With remarkable optoelectronic synaptic characteristics of the fabricated device,a significant enhancement was demonstrated in recognition probability—averaging an impressive 85.9% for low-contrast scenarios,in contrast to the mere 47.5% exhibited by traditional photomemristors.This holds substantial implications for the detection and recognition of subtle information in diverse scenes such as autonomous driving,medical imaging,and astronomical observation.展开更多
Interfacial ferroelectricity is a recently established mechanism for generating spontaneous reversible electric polarization,arising from the charge transfer between stacked van der Waals layered atomic crystals.It ha...Interfacial ferroelectricity is a recently established mechanism for generating spontaneous reversible electric polarization,arising from the charge transfer between stacked van der Waals layered atomic crystals.It has been realized in both naturally formed multilayer crystals and moirésuperlattices.Owing to the large number of material choices and combinations,this approach is highly versatile,greatly expanding the scope of ultrathin ferroelectrics.A key advantage of interfacial ferroelectricity is its potential to couple with preexisting properties of the constituent layers,enabling their electrical manipulation through ferroelectric switching and paving the way for advanced device functionalities.This review article summarizes recent experimental progress in interfacial ferroelectricity,with an emphasis on its coupling with a variety of electronic properties.After introducing the underlying mechanism of interfacial ferroelectricity and the range of material systems discovered to date,we highlight selected examples showcasing ferroelectric control of excitonic optical properties,Berry curvature effects,and superconductivity.We also discuss the challenges and opportunities that await further studies in this field.展开更多
Lithium niobate(LN)has remained at the forefront of academic research and industrial applications due to its rich material properties,which include second-order nonlinear optic,electro-optic,and piezoelectric properti...Lithium niobate(LN)has remained at the forefront of academic research and industrial applications due to its rich material properties,which include second-order nonlinear optic,electro-optic,and piezoelectric properties.A further aspect of LN’s versatility stems from the ability to engineer ferroelectric domains with micro and even nano-scale precision in LN,which provides an additional degree of freedom to design acoustic and optical devices with improved performance and is only possible in a handful of other materials.In this review paper,we provide an overview of the domain engineering techniques developed for LN,their principles,and the typical domain size and pattern uniformity they provide,which is important for devices that require high-resolution domain patterns with good reproducibility.It also highlights each technique's benefits,limitations,and adaptability for an application,along with possible improvements and future advancement prospects.Further,the review provides a brief overview of domain visualization methods,which is crucial to gain insights into domain quality/shape and explores the adaptability of the proposed domain engineering methodologies for the emerging thin-film lithium niobate on an insulator platform,which creates opportunities for developing the next generation of compact and scalable photonic integrated circuits and high frequency acoustic devices.展开更多
Van der Waals(vdW)ferroelectric-semiconductor heterojunction provides reconfigurable band alignment based on optical/electrical-assisted polarization switching,which shows great potential to construct artificial visua...Van der Waals(vdW)ferroelectric-semiconductor heterojunction provides reconfigurable band alignment based on optical/electrical-assisted polarization switching,which shows great potential to construct artificial visual neural systems.However,the mechanical exfoliation fabrication scheme for proof-of-concept demonstrations and fundamental studies is cumbersome and not scalable for practical application.Here,we present a synthetic strategy for the large-scale and high crystallinity growth of planar/verticalα-In_(2)Se_(3)/MoS_(2)heterojunctions by dynamically tuning the growth temperature.Furthermore,based on theα-In_(2)Se_(3)/MoS_(2)heterostructures,photo-synapse devices are designed and fabricated to simulate visual neural systems functions,including multistate storage,optical logic operation,potentiation and depression,paired-pulse facilitation(PPF),short-term memory(STM),long-term memory(LTM),and Learning-Forgetting-Relearning.By coupling the spatiotemporally relevant optical and electric information,the device can mimic the superior biological visual system’s light adaptation and Pavlovian conditioning.This work provides a strategy for dynamically tuning the orientation of ferroelectric-semiconductor heterojunction stacks and will give impetus to applying all-in-one sensing and memory-computing artificial vision systems.展开更多
Intergrowth ferroelectric semiconductors with excellent spontaneous polarization field are highly promising piezo-photocatalytic candidate materials.In addition,developing structural design and revealing polarization ...Intergrowth ferroelectric semiconductors with excellent spontaneous polarization field are highly promising piezo-photocatalytic candidate materials.In addition,developing structural design and revealing polarization enhancement in-depth mechanism are top priorities.Herein,we introduce the intergrowth ferroelectrics Bi_(7)Ti_(4)NbO_(21)thin-layer nanosheets for piezo-photocatalytic CO_(2)reduction.Density functional theory(DFT)calculations indicate that interlayer lattice mismatch leads to increased tilting and rotation angle of Ti/NbO_(6)octahedra on perovskite-like layers,serving as the main reason for increased polarization.Furthermore,the tilting and rotation angle of the interlayer octahedron further increase under stress,suggesting a stronger driving force generated to facilitate charge carrier separation efficiency.Meanwhile,Bi_(7)Ti_(4)NbO_(21)nanosheets provide abundant active sites to effectively adsorb CO_(2)and acquire sensitive stress response,thereby presenting synergistically advanced piezo-photocatalytic CO_(2)reduction activity with a high CO generation rate of 426.97μmol g^(-1)h^(-1).Our work offers new perspectives and directions for initiating and investigating the mechanisms of high-performance intergrowth piezo-photocatalysts.展开更多
In the realm of optoelectronics,photodetectors play pivotal roles,with applications spanning from high-speed data communication to precise environmental sensing.Despite the advancements,conventional photodetectors gra...In the realm of optoelectronics,photodetectors play pivotal roles,with applications spanning from high-speed data communication to precise environmental sensing.Despite the advancements,conventional photodetectors grapple with challenges with response speed and dark current.In this study,we present a photodetector based on a lateral MoTe_(2)p-n junction,defined by a semi-floating ferroelectric gate.The strong ferroelectric fields and the depletion region of the p-n junction in the device are notably compact,which diminish the carrier transit time,thereby enhancing the speed of the photoelectric response.The non-volatile MoTe_(2)homojunction,under the influence of external gate voltage pulses,can alter the orientation of the intrinsic electric field within the junction.As a photovoltaic detector,it achieves an ultra-low dark current of 20 pA,and a fast photo response of 2μs.The spectral response is extended to the shortwave infrared range at 1550 nm.Furthermore,a logic computing system with light/no light as binary input is designed to convert the current signal to the voltage output.This research not only underscores the versatility of 2D materials in the realm of sophisticated photodetector design but also heralds new avenues for their application in energy-efficient,high-performance optoelectronic devices.展开更多
Recent advances in van der Waals(vdW) ferroelectrics have sparked the development of related heterostructures with non-volatile and field-tunable functionalities. In vdW ferroelectric heterojunctions, the interfacial ...Recent advances in van der Waals(vdW) ferroelectrics have sparked the development of related heterostructures with non-volatile and field-tunable functionalities. In vdW ferroelectric heterojunctions, the interfacial electrical characteristics play a crucial role in determining their performance and functionality. In this study,we explore the interfacial polarization coupling in two-dimensional(2D) ferroelectric heterojunctions by fabricating a graphene/h-BN/CuInP_(2)S_(6)/α-In_(2)Se_(3)/Au ferroelectric field-effect transistor. By varying the gate electric field, the CuInP_(2)S_(6)/α-In_(2)Se_(3) heterojunction displays distinct interfacial polarization coupling states, resulting in significantly different electrical transport behaviors. Under strong gate electric fields, the migration of Cu ions further enhances the interfacial polarization effect, enabling continuous tuning of both the polarization state and carrier concentration in α-In_(2)Se_(3). Our findings offer valuable insights for the development of novel multifunctional devices based on 2D ferroelectric materials.展开更多
Ferroelectric materials are widely applied in the ferroelectronic devices,photovoltaics,and so on.Ultrathin ferroelectric thin films are highly desired for their applications,which still remain a challenge.In this wor...Ferroelectric materials are widely applied in the ferroelectronic devices,photovoltaics,and so on.Ultrathin ferroelectric thin films are highly desired for their applications,which still remain a challenge.In this work,the ultrathin barium titanate(BaTiO_(3),BTO)films are deposited directly on the fluorine-doped tin oxide glass(SnO_(2):F,FTO)substrates by radio frequency magnetron sputtering method at different temperatures.All BTO ultrathin films exhibit strong ferroelectric properties.Interestingly,BTO thin films deposited at room temperature(RT)also exhibit robust ferroelectricity.The polar domains are switched reversibly with a phase degree of~180°by piezoelectric force microscopy for the BTO thin films deposited at room temperature,attributing to the strain and ion migration.展开更多
Poly(vinylidene-trifluoroethylene) [P(VDF-TrFE)] copolymer films generally demonstrate limited compatibility with organic semiconductors. The material is frequently compromised by exposure to organic semiconductor sol...Poly(vinylidene-trifluoroethylene) [P(VDF-TrFE)] copolymer films generally demonstrate limited compatibility with organic semiconductors. The material is frequently compromised by exposure to organic semiconductor solutions and other fabrication processes utilized in the production of organic ferroelectric transistors. In this study, an organic ferroelectric field effect transistor(OFeFET) with the 6,13-Bis(triisopropylsilylethynyl) pentacene(TIPS-pentacene) channel is fabricated, in which the aluminum oxide(Al_(2)O_(3)) interlayer is used to improve compatibility. The device displays polymorphic memory and synaptic plasticity of long-term potentiation and depression. Furthermore, an artificial neural network constructed using our devices is simulated to succeed in recognizing the MNIST handwritten digit database with a high accuracy of 92.8%. This research offers a viable approach to enhance the compatibility of the organic ferroelectric polymer P(VDF-TrFE) with organic semiconductors.展开更多
Ferroelectric topological insulators realized in heterostructures of two topologically trivial two-dimensional materials have recently attracted significant interest. Using first-principles calculations combined with ...Ferroelectric topological insulators realized in heterostructures of two topologically trivial two-dimensional materials have recently attracted significant interest. Using first-principles calculations combined with topological quantum chemistry, we investigate bilayer α-In_(2) Se_(3)(2 L-In_(2) Se_(3)) in van der Waals heterostructures with XSe(X = Ga, In, Tl) substrates within space group P 3m1(No. 156). We show that the emergence of ferroelectricity-driven topological phase transitions in these systems is dictated by fundamental symmetry principles rather than material-specific effects. The band bending at the XSe/2 L-In_(2) Se_(3) interface enables topological band inversions, with higher-electron-affinity substrates such as GaSe and TlSe favoring the transition. Remarkably, GaSe/2 L-In_(2) Se_(3) exhibits a reversible transition between topological and trivial insulating phases upon polarization switching, while TlSe/2 L-In_(2) Se_(3) undergoes sequential transitions from a topological insulator to a trivial insulator and eventually to a metallic state. This multistate manipulation highlights a viable route for designing tunable, low-power, multi-functional electronic devices.展开更多
Recent theoretical work has predicted the existence of a“dipole spiral”structure in strained freestanding membranes of PbTiO3,suggesting a potential route to enhanced electromechanical responses[Phys.Rev.Lett.133046...Recent theoretical work has predicted the existence of a“dipole spiral”structure in strained freestanding membranes of PbTiO3,suggesting a potential route to enhanced electromechanical responses[Phys.Rev.Lett.133046802(2024)].However,its microscopic nature,energetic landscape,and electronic properties remain largely unexplored from a first-principles perspective.Here,using density functional theory on PbTiO3 under biaxial tensile strain,we identify a novel form of polar order:a chiral,non-collinear ferroelectric double helix.We find that two distinct,intertwined polarization helices are formed by the local Pb-O and Ti-O dipoles,reminiscent of DNA.This topology is stabilized by a collective helical twisting of the encompassing oxygen cages(the polyhedra for both Pb and Ti cations),which gives rise to an electric Dzyaloshinskii–Moriya-like interaction.The resulting structure,which can be conceptualized as a“self-moiré”crystal,exhibits two coupled functionalities.First,it possesses a rotational pseudo-zero-energy mode that underpins a giant piezoelectric response(e_(33)≈16C/m^(2)).Second,the long-period potential reconstructs the electronic band structure,leading to a multi-valley electronic topology at the valence band edge.Our work establishes a physical route to designing complex chiral order that supports both giant electromechanical coupling and multi-valley electronics.展开更多
Doped HfO_(2)as an emerging ferroelectric material,holds considerable promise for non-volatile memory applications.Epitaxial growth of doped HfO_(2)thin films is widely adopted as an effective technique for revealing ...Doped HfO_(2)as an emerging ferroelectric material,holds considerable promise for non-volatile memory applications.Epitaxial growth of doped HfO_(2)thin films is widely adopted as an effective technique for revealing the intrinsic ferroelectric properties.In this study,based on systematic structural,chemical and electrical investigations,the influences of Mn doping and substrate orientation on ferroelectric properties of Mn-doped HfO_(2)epitaxial thin films are investigated.The results demonstrate that Mn-doped HfO_(2)thin films with orthorhombic phase can be epitaxially grown along[111]out-of-plane direction on both SrTiO_(3)(001)and(110)substrates,and 10%Mn-doping significantly stabilizes the orthorhombic polar phase and enhances the ferroelectric polarization.Interestingly,compared to the films on SrTiO_(3)(001)substrate,the better crystallinity and reduction of oxygen vacancy amount in Mn-doped HfO_(2)films grown on the SrTiO_(3)(110)substrate are observed,which enhance the remanent polarization and reduce the coercive field.It provides an effective approach for the controllable regulation of defects and the enhancement of intrinsic ferroelectricity in HfO_(2)-based materials.展开更多
Ferroelectric materials are gaining increasing attention for the development of advanced catalytic technologies due to their field-responsive polarization states.However,achieving dynamic optimization of catalytic act...Ferroelectric materials are gaining increasing attention for the development of advanced catalytic technologies due to their field-responsive polarization states.However,achieving dynamic optimization of catalytic activity using ferroelectrics remains a fundamental challenge.Inspired by the force-adaptive mechanisms of fish scales,we introduce an intracrystalline force regulation strategy to dynamically control cobalt spin states and enhance peroxymonosulfate(PMS)activation in Fenton-like processes.This approach utilizes BaTi_(0.92)Co_(0.08)O_(3-δ)(BTC-8)nano-ferroelectrics,where ultrasound irradiation generates a built-in electric field that drives electrons towards cobalt sites.This electron transfer is further facilitated by electronegativity differences between cobalt and barium/titanium ions.The resulting piezo-driven electron flow promotes continuous regeneration of high-spin Co^(2+),enhancing PMS adsorption and SO_(4)^(-)-OH bond cleavage,leading to increased production of⋅SO_(4)^(-)and singlet oxygen(^(1)O_(2))for organic pollutant degradation.Consequently,BTC-8 achieves a reaction rate(k=1.7960 min^(-1))28.93 times higher than that of pure barium titanate,surpassing previously reported PMS activation and piezocatalytic systems.This work represents a shift from static electronic structure design to dynamic electronic engineering in the development of advanced catalytic strategies for water remediation.展开更多
Ferroelectric film materials have attracted significant interest due to their potential for harvesting various forms ofclean energy from natural environmental sources.However,the photoelectric performance of these mat...Ferroelectric film materials have attracted significant interest due to their potential for harvesting various forms ofclean energy from natural environmental sources.However,the photoelectric performance of these materials isfrequently constrained by heat generation during light absorption,resulting in significant thermal losses.Most offerroelectric films produce photocurrent and thermocurrent with opposite polarity,thus weakening the coupledphoto-thermoelectric output of the devices.Here we report on a LaNiO_(3)/BiMn_(2)O_(5)(BMO)/ITO ferroelectric film toproduce photocurrent and thermocurrent with the same polarity.The polarity of the photocurrent generated bythe BMO film is shown to be determined solely by the direction of spontaneous polarization,overcoming thedetrimental effect of Schottky barrier for energy harvesting in device.We propose a new strategy to enhance thecoupling factor,thereby offering valuable new insights for optimizing the utilization of ferroelectric materials inboth light and heat energy applications.展开更多
To address the global energy shortage,hydrogen production as a green energy source has become one of the most prominent research topics over the past decade.Novel and promising ferroelectric materials,exhibiting uniqu...To address the global energy shortage,hydrogen production as a green energy source has become one of the most prominent research topics over the past decade.Novel and promising ferroelectric materials,exhibiting unique spontaneous polarization capabilities,have shown great potential in the field of photocatalytic hydrogen evolution.Among these materials,perovskites represent a significant group of ferroelectrics,possessing both excellent ferroelectric properties and photocatalytic performance.By focusing on perovskites,we analyze the advantages of their built-in electric field for photocatalytic hydrogen evolution,integrating the domain wall structures of ferroelectrics.Furthermore,we summarize how to fully exploit the unique characteristics of ferroelectrics and highlight recent advancements in their application to photocatalytic hydrogen evolution.展开更多
Poly(vinylidene fluoride)(PVDF)based piezoelectric materials have received tremendous scientific attention for many decades.However,the high output power density remains a significant challenge and an area of intense ...Poly(vinylidene fluoride)(PVDF)based piezoelectric materials have received tremendous scientific attention for many decades.However,the high output power density remains a significant challenge and an area of intense interest.Herein,we present a piezoelectric sensor with high output power density by incorporating liquid metal(LM)microdroplets into PVDF piezoelectric substrate.Remarkably,the LM/PVDF composite showed theβ-phase content above 90%and the output power density is enhanced to 353μW/cm^(2),nearly 1000 times higher than that of pure PVDF materials and significantly surpassing other PVDF-based composite materials.These exceptional performances are attributed to two key factors:The formation of a liquid-solid/electric-dielectric interface between the LM and PVDF,and the incorporation of the LM's outstanding charge transfer capability.This work might present an effective strategy for advancing the utilization of PVDF-based piezoelectric materials in compelling applications within the realm of intelligent wearable electronics.展开更多
The performance optimization of materials is an eternal theme and challenge in scientific research,which is reflected in ferroelectric filed to two hot topics of enhancing Curie temperature(TC)and functional versatili...The performance optimization of materials is an eternal theme and challenge in scientific research,which is reflected in ferroelectric filed to two hot topics of enhancing Curie temperature(TC)and functional versatility.The former one vitally determines ferroelectric operational temperature range while the latter would open up new application possibilities.Effective chemical modification or doping strategies on A-site and X-site components have been successfully developed in hybrid organic-inorganic perovskite(HOIP)ferroelectrics,however,the important role of adjusting B-site ions has long been overlooked.Here,we have implemented regulation on the ion radius of the B-site component to successfully obtain two new HOIP ferroelectrics(3-pyrrolinium)BBr_(3)(B=Mn and Ni).Compared to parent(3-pyrrolinium)CdBr_(3),the TC(△T=99 K)was significantly optimized by replacing the Cd^(2+)with smaller Mn^(2+)or Ni^(2+)ions.More strikingly,the introduction of Mn^(2+)and Ni^(2+)ions with octahedral coordination bring out intriguing red emission and magnetism respectively,making the multifunctional integration in a single material for multiple uses.This work provides a feasible strategy for performance optimizing of HOIP ferroelectrics,and would shed light for constructing multifunctional ferroelectrics.展开更多
Two-dimensional perovskite ferroelectric which strongly couple ferroelectricity with semiconducting properties are promising candidates for optoelectronic applications.However,it is still a great challenge to fabricat...Two-dimensional perovskite ferroelectric which strongly couple ferroelectricity with semiconducting properties are promising candidates for optoelectronic applications.However,it is still a great challenge to fabricate self-powered broadband photodetectors with low detection limit.Herein,we successfully realized self-powered broadband photodetection with low detection limit by using a trilayered perovskite ferroelectric(BA)_(2)EA_(2)Pb_(3)I_(10)(1,BA=n-butylamine,EA=ethylamine).Giving to its large spontaneous polarization(5.6μC/cm^(2)),1 exhibits an open-circuit voltage of 0.25 V which provide driving force to separate carriers.Combining with its low dark current(~10^(-14)A)and narrow bandgap(Eg=1.86 e V),1 demonstrates great potential on detecting the broadband weak lights.Thus,a prominent photodetection performance with high open-off ratio(~10^(5)),outstanding responsivity(>10 m A/W),and promising detectivity(>1011Jones),as well as the low detecting limit(~nW/cm^(2))among the wide wavelength from 377 nm to637 nm was realized based on the single crystal of 1.This work demonstrates the great potential of 2D perovskite ferroelectric on self-powered broadband photodetectors.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 11304160the Special Fund for Public Interest of China under Grant No 201510068,and the NUPTFC under Grant No NY215111
文摘Properties of ferroelectric xBiInO3-（1-x）PbTiO3（xBI-（1-x）PT） thin films deposited on（101） SrRuO3/（200）Pt/（200） MgO substrates by rf magnetron sputtering method and effects of deposition conditions are investigated.The structures of the xBI-（1-x）PT films are characterized by x-ray diffraction and scanning electron microscopy.The results indicate that the thin films are grown with mainly（001） orientation. The chemical compositions of the films are analyzed by scanning electron probe and the results indicate that the loss phenomena of Pb and Bi elements depend on the pressure and temperature during the sputtering process.The sputtering parameters including target composition, substrate temperature, and gas pressure are adjusted to obtain optimum sputtering conditions. To decrease leakage currents,2 mol% La2 O3 is doped in the targets. The P-E hysteresis loops show that the optimized xBI-（1-x）PT（x = 0.24） film has high ferroelectricities with remnant polarization2 Pr = 80μC/cm2 and coercive electric field 2 EC = 300 kV/cm. The Curie temperature is about 640℃. The results show that the films have optimum performance and will have wide applications.
基金financially supported by Shenzhen Science and Technology Program(JCYJ20240813142900001)Guangdong Provincial Key Laboratory of New Energy Materials Service Safety。
文摘Chloride-based solid electrolytes are considered promising candidates for next-generation high-energy-density all-solid-state batteries(ASSBs).However,their relatively low oxidative decomposition threshold(~4.2 V vs.Li^(+)/Li)constrains their use in ultrahighvoltage systems(e.g.,4.8 V).In this work,ferroelectric Ba TiO_(3)(BTO)nanoparticles with optimized thickness of~50-100 nm were successfully coated onto Li_(2.5)Y_(0.5)Zr_(0.5)Cl_(6)(LYZC@5BTO)electrolytes using a time-efficient ball-milling process.The nanoparticle-induced interfacial ionic conduction enhancement mechanism contributed to the preservation of LYZC’s high ionic conductivity,which remained at 1.06 m S cm^(-1)for LYZC@5BTO.Furthermore,this surface electric field engineering strategy effectively mitigates the voltage-induced self-decomposition of chloride-based solid electrolytes,suppresses parasitic interfacial reactions with single-crystal NCM811(SCNCM811),and inhibits the irreversible phase transition of SCNCM811.Consequently,the cycling stability of LYZC under high-voltage conditions(4.8 V vs.Li+/Li)is significantly improved.Specifically,ASSB cells employing LYZC@5BTO exhibited a superior discharge capacity of 95.4 m Ah g^(-1)over 200 cycles at 1 C,way outperforming cell using pristine LYZC that only shows a capacity of 55.4 m Ah g^(-1).Furthermore,time-of-flight secondary ion mass spectrometry and X-ray photoelectron spectroscopy analysis revealed that Metal-O-Cl by-products from cumulative interfacial side reactions accounted for 6% of the surface species initially,rising to 26% after 200 cycles in pristine LYZC.In contrast,LYZC@5BTO limited this increase to only 14%,confirming the effectiveness of BTO in stabilizing the interfacial chemistry.This electric field modulation strategy offers a promising route toward the commercialization of high-voltage solid-state electrolytes and energy-dense ASSBs.
基金supported by the National Key Research and Development Program of China for International Cooperation under Grant 2023YFE0117100the National Natural Science Foundation of China(Nos.62074040 and 62074045).
文摘Photoresponsive memristors(i.e.,photomemristors)have been recently highly regarded to tackle data latency and energy consumption challenges in conventional Von Neumann architecture-based image recognition systems.However,their efficacy in recognizing low-contrast images is quite limited,and while preprocessing algorithms are usually employed to enhance these images,which naturally introduce delays that hinder real-time recognition in complex conditions.To address this challenge,here we present a selfdriven polarization-sensitive ferroelectric photomemristor inspired by advanced biological systems.The proposed prototype device is engineered to extract image polarization information,enabling real-time and in-situ enhanced image recognition and classification capabilities.By combining the anisotropic optical feature of the two-dimensional material(ReSe_(2))and ferroelectric polarization of singlecrystalline diisopropylammonium bromide(DIPAB)thin film,tunable and self-driven polarized responsiveness with intelligence was achieved.With remarkable optoelectronic synaptic characteristics of the fabricated device,a significant enhancement was demonstrated in recognition probability—averaging an impressive 85.9% for low-contrast scenarios,in contrast to the mere 47.5% exhibited by traditional photomemristors.This holds substantial implications for the detection and recognition of subtle information in diverse scenes such as autonomous driving,medical imaging,and astronomical observation.
基金Project supported by the Natural Science Foundation of Jiangsu Province(Grant Nos.BK20231529 and BK20233001)the National Key Research and Development Program of China(Grant No.2024YFA1409100)+2 种基金the Fundamental Research Funds for the Central Universities(Grant No.0204-14380233)the National Natural Science Foundation of China(Grant Nos.12474170 and 123B2059)the National Postdoctoral Program for Innovative Talents(Grant No.BX20240160)。
文摘Interfacial ferroelectricity is a recently established mechanism for generating spontaneous reversible electric polarization,arising from the charge transfer between stacked van der Waals layered atomic crystals.It has been realized in both naturally formed multilayer crystals and moirésuperlattices.Owing to the large number of material choices and combinations,this approach is highly versatile,greatly expanding the scope of ultrathin ferroelectrics.A key advantage of interfacial ferroelectricity is its potential to couple with preexisting properties of the constituent layers,enabling their electrical manipulation through ferroelectric switching and paving the way for advanced device functionalities.This review article summarizes recent experimental progress in interfacial ferroelectricity,with an emphasis on its coupling with a variety of electronic properties.After introducing the underlying mechanism of interfacial ferroelectricity and the range of material systems discovered to date,we highlight selected examples showcasing ferroelectric control of excitonic optical properties,Berry curvature effects,and superconductivity.We also discuss the challenges and opportunities that await further studies in this field.
基金supported by the Australian Research Council Centre of Excellence in Optical Microcombs for Breakthrough Science COMBS(CE230100006)the Australian Research Council grants DP220100488 and DE230100964funded by the Australian Government.
文摘Lithium niobate(LN)has remained at the forefront of academic research and industrial applications due to its rich material properties,which include second-order nonlinear optic,electro-optic,and piezoelectric properties.A further aspect of LN’s versatility stems from the ability to engineer ferroelectric domains with micro and even nano-scale precision in LN,which provides an additional degree of freedom to design acoustic and optical devices with improved performance and is only possible in a handful of other materials.In this review paper,we provide an overview of the domain engineering techniques developed for LN,their principles,and the typical domain size and pattern uniformity they provide,which is important for devices that require high-resolution domain patterns with good reproducibility.It also highlights each technique's benefits,limitations,and adaptability for an application,along with possible improvements and future advancement prospects.Further,the review provides a brief overview of domain visualization methods,which is crucial to gain insights into domain quality/shape and explores the adaptability of the proposed domain engineering methodologies for the emerging thin-film lithium niobate on an insulator platform,which creates opportunities for developing the next generation of compact and scalable photonic integrated circuits and high frequency acoustic devices.
基金supported by the National Natural Science Foundation of China(Nos.52371245,12174237,12241403)the National Key Research and Development Program of China(No.2022YFB3505301).
文摘Van der Waals(vdW)ferroelectric-semiconductor heterojunction provides reconfigurable band alignment based on optical/electrical-assisted polarization switching,which shows great potential to construct artificial visual neural systems.However,the mechanical exfoliation fabrication scheme for proof-of-concept demonstrations and fundamental studies is cumbersome and not scalable for practical application.Here,we present a synthetic strategy for the large-scale and high crystallinity growth of planar/verticalα-In_(2)Se_(3)/MoS_(2)heterojunctions by dynamically tuning the growth temperature.Furthermore,based on theα-In_(2)Se_(3)/MoS_(2)heterostructures,photo-synapse devices are designed and fabricated to simulate visual neural systems functions,including multistate storage,optical logic operation,potentiation and depression,paired-pulse facilitation(PPF),short-term memory(STM),long-term memory(LTM),and Learning-Forgetting-Relearning.By coupling the spatiotemporally relevant optical and electric information,the device can mimic the superior biological visual system’s light adaptation and Pavlovian conditioning.This work provides a strategy for dynamically tuning the orientation of ferroelectric-semiconductor heterojunction stacks and will give impetus to applying all-in-one sensing and memory-computing artificial vision systems.
基金support from the Natural Science Foundation of Jiangsu Province(BK20220596)Innovative science and technology platform project of cooperation between Yangzhou City and Yangzhou University,China(No.YZ202026305)+1 种基金Natural Science Foundation of China(21922202,21673202 and 22272147)the Priority Academic Program Development of Jiangsu Higher Education Institutions.
文摘Intergrowth ferroelectric semiconductors with excellent spontaneous polarization field are highly promising piezo-photocatalytic candidate materials.In addition,developing structural design and revealing polarization enhancement in-depth mechanism are top priorities.Herein,we introduce the intergrowth ferroelectrics Bi_(7)Ti_(4)NbO_(21)thin-layer nanosheets for piezo-photocatalytic CO_(2)reduction.Density functional theory(DFT)calculations indicate that interlayer lattice mismatch leads to increased tilting and rotation angle of Ti/NbO_(6)octahedra on perovskite-like layers,serving as the main reason for increased polarization.Furthermore,the tilting and rotation angle of the interlayer octahedron further increase under stress,suggesting a stronger driving force generated to facilitate charge carrier separation efficiency.Meanwhile,Bi_(7)Ti_(4)NbO_(21)nanosheets provide abundant active sites to effectively adsorb CO_(2)and acquire sensitive stress response,thereby presenting synergistically advanced piezo-photocatalytic CO_(2)reduction activity with a high CO generation rate of 426.97μmol g^(-1)h^(-1).Our work offers new perspectives and directions for initiating and investigating the mechanisms of high-performance intergrowth piezo-photocatalysts.
基金Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB0580000)Natural Science Foundation of China(62222413,62025405,62105100,62075228 and 62334001)+1 种基金Natural Science Foundation of Shanghai(23ZR1473400)Hundred Talents Program of the Chinese Academy of Sciences。
文摘In the realm of optoelectronics,photodetectors play pivotal roles,with applications spanning from high-speed data communication to precise environmental sensing.Despite the advancements,conventional photodetectors grapple with challenges with response speed and dark current.In this study,we present a photodetector based on a lateral MoTe_(2)p-n junction,defined by a semi-floating ferroelectric gate.The strong ferroelectric fields and the depletion region of the p-n junction in the device are notably compact,which diminish the carrier transit time,thereby enhancing the speed of the photoelectric response.The non-volatile MoTe_(2)homojunction,under the influence of external gate voltage pulses,can alter the orientation of the intrinsic electric field within the junction.As a photovoltaic detector,it achieves an ultra-low dark current of 20 pA,and a fast photo response of 2μs.The spectral response is extended to the shortwave infrared range at 1550 nm.Furthermore,a logic computing system with light/no light as binary input is designed to convert the current signal to the voltage output.This research not only underscores the versatility of 2D materials in the realm of sophisticated photodetector design but also heralds new avenues for their application in energy-efficient,high-performance optoelectronic devices.
基金supported by the Chinese Academy of Sciences Project for Young Scientists in Basic Research(Grant No.YSBR-049)the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302800)the Fundamental Research Funds for the Central Universities(Grant No.WK3510000013)。
文摘Recent advances in van der Waals(vdW) ferroelectrics have sparked the development of related heterostructures with non-volatile and field-tunable functionalities. In vdW ferroelectric heterojunctions, the interfacial electrical characteristics play a crucial role in determining their performance and functionality. In this study,we explore the interfacial polarization coupling in two-dimensional(2D) ferroelectric heterojunctions by fabricating a graphene/h-BN/CuInP_(2)S_(6)/α-In_(2)Se_(3)/Au ferroelectric field-effect transistor. By varying the gate electric field, the CuInP_(2)S_(6)/α-In_(2)Se_(3) heterojunction displays distinct interfacial polarization coupling states, resulting in significantly different electrical transport behaviors. Under strong gate electric fields, the migration of Cu ions further enhances the interfacial polarization effect, enabling continuous tuning of both the polarization state and carrier concentration in α-In_(2)Se_(3). Our findings offer valuable insights for the development of novel multifunctional devices based on 2D ferroelectric materials.
基金financially supported by the National Key Research and Development Program of China(No.2019YFB1503500)
文摘Ferroelectric materials are widely applied in the ferroelectronic devices,photovoltaics,and so on.Ultrathin ferroelectric thin films are highly desired for their applications,which still remain a challenge.In this work,the ultrathin barium titanate(BaTiO_(3),BTO)films are deposited directly on the fluorine-doped tin oxide glass(SnO_(2):F,FTO)substrates by radio frequency magnetron sputtering method at different temperatures.All BTO ultrathin films exhibit strong ferroelectric properties.Interestingly,BTO thin films deposited at room temperature(RT)also exhibit robust ferroelectricity.The polar domains are switched reversibly with a phase degree of~180°by piezoelectric force microscopy for the BTO thin films deposited at room temperature,attributing to the strain and ion migration.
基金supported by the National Key Research and Development program of China (Nos. 2024YFA1410700 and 2021YFA1200700)the National Natural Science Foundation of China (Nos. T2222025, 62174053, 62474065 and 52372120)+3 种基金the Natural Science Foundation of Chongqing (CSTB2024NSCQ-JQX0005)the Shanghai Science and Technology Innovation Action Plan (Nos. 24QA2702300 and 24YF2710400)the National Postdoctoral Program (GZB20240225)the Fundamental Research Funds for the Central Universities。
文摘Poly(vinylidene-trifluoroethylene) [P(VDF-TrFE)] copolymer films generally demonstrate limited compatibility with organic semiconductors. The material is frequently compromised by exposure to organic semiconductor solutions and other fabrication processes utilized in the production of organic ferroelectric transistors. In this study, an organic ferroelectric field effect transistor(OFeFET) with the 6,13-Bis(triisopropylsilylethynyl) pentacene(TIPS-pentacene) channel is fabricated, in which the aluminum oxide(Al_(2)O_(3)) interlayer is used to improve compatibility. The device displays polymorphic memory and synaptic plasticity of long-term potentiation and depression. Furthermore, an artificial neural network constructed using our devices is simulated to succeed in recognizing the MNIST handwritten digit database with a high accuracy of 92.8%. This research offers a viable approach to enhance the compatibility of the organic ferroelectric polymer P(VDF-TrFE) with organic semiconductors.
基金supported by the National Natural Science Foundation of China (Grant Nos.11874141,12174059,and 11604134)。
文摘Ferroelectric topological insulators realized in heterostructures of two topologically trivial two-dimensional materials have recently attracted significant interest. Using first-principles calculations combined with topological quantum chemistry, we investigate bilayer α-In_(2) Se_(3)(2 L-In_(2) Se_(3)) in van der Waals heterostructures with XSe(X = Ga, In, Tl) substrates within space group P 3m1(No. 156). We show that the emergence of ferroelectricity-driven topological phase transitions in these systems is dictated by fundamental symmetry principles rather than material-specific effects. The band bending at the XSe/2 L-In_(2) Se_(3) interface enables topological band inversions, with higher-electron-affinity substrates such as GaSe and TlSe favoring the transition. Remarkably, GaSe/2 L-In_(2) Se_(3) exhibits a reversible transition between topological and trivial insulating phases upon polarization switching, while TlSe/2 L-In_(2) Se_(3) undergoes sequential transitions from a topological insulator to a trivial insulator and eventually to a metallic state. This multistate manipulation highlights a viable route for designing tunable, low-power, multi-functional electronic devices.
基金supported by Zhejiang Provincial Natural Science Foundation of China(Grant No.LR25A040004)。
文摘Recent theoretical work has predicted the existence of a“dipole spiral”structure in strained freestanding membranes of PbTiO3,suggesting a potential route to enhanced electromechanical responses[Phys.Rev.Lett.133046802(2024)].However,its microscopic nature,energetic landscape,and electronic properties remain largely unexplored from a first-principles perspective.Here,using density functional theory on PbTiO3 under biaxial tensile strain,we identify a novel form of polar order:a chiral,non-collinear ferroelectric double helix.We find that two distinct,intertwined polarization helices are formed by the local Pb-O and Ti-O dipoles,reminiscent of DNA.This topology is stabilized by a collective helical twisting of the encompassing oxygen cages(the polyhedra for both Pb and Ti cations),which gives rise to an electric Dzyaloshinskii–Moriya-like interaction.The resulting structure,which can be conceptualized as a“self-moiré”crystal,exhibits two coupled functionalities.First,it possesses a rotational pseudo-zero-energy mode that underpins a giant piezoelectric response(e_(33)≈16C/m^(2)).Second,the long-period potential reconstructs the electronic band structure,leading to a multi-valley electronic topology at the valence band edge.Our work establishes a physical route to designing complex chiral order that supports both giant electromechanical coupling and multi-valley electronics.
基金supported by the National Natural Science Foundation of China(Grant Nos.52125204,52250281,52422209,92163210,and U21A2066)the Na-tional Key Research and Development Program of China(Grant Nos.2024YFA1208601,2022YFB3807602,and 2022YFB3807604).
文摘Doped HfO_(2)as an emerging ferroelectric material,holds considerable promise for non-volatile memory applications.Epitaxial growth of doped HfO_(2)thin films is widely adopted as an effective technique for revealing the intrinsic ferroelectric properties.In this study,based on systematic structural,chemical and electrical investigations,the influences of Mn doping and substrate orientation on ferroelectric properties of Mn-doped HfO_(2)epitaxial thin films are investigated.The results demonstrate that Mn-doped HfO_(2)thin films with orthorhombic phase can be epitaxially grown along[111]out-of-plane direction on both SrTiO_(3)(001)and(110)substrates,and 10%Mn-doping significantly stabilizes the orthorhombic polar phase and enhances the ferroelectric polarization.Interestingly,compared to the films on SrTiO_(3)(001)substrate,the better crystallinity and reduction of oxygen vacancy amount in Mn-doped HfO_(2)films grown on the SrTiO_(3)(110)substrate are observed,which enhance the remanent polarization and reduce the coercive field.It provides an effective approach for the controllable regulation of defects and the enhancement of intrinsic ferroelectricity in HfO_(2)-based materials.
基金the National Natural Science Foundation of China(Grant No.U2002217,52102342,52103024 and 12404116)Key Research Program of the Chinese Academy of Sciences(Grant No.ZDRW-CN2021-3-1-18)+5 种基金Chenguang Program of Shanghai Education Development Foundation,Shanghai Municipal Education Commission(Grant No.21CGA40)9th Young Elite Scientists Sponsorship Program by CAST(Grant No.2023QNRC001)10th Young Elite Scientists Sponsorship Program by CAST(Grant No.YESS20240270)the Postdoctoral Fellowship Program of CPSF(Grant No.GZC20232832)Donghua University 2024 Cultivation Project of Discipline Innovation(Grant No.xkcx-202413)Student Training Program for Innovation and Entrepreneurship of Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences(Grant No.CXCY20230305).
文摘Ferroelectric materials are gaining increasing attention for the development of advanced catalytic technologies due to their field-responsive polarization states.However,achieving dynamic optimization of catalytic activity using ferroelectrics remains a fundamental challenge.Inspired by the force-adaptive mechanisms of fish scales,we introduce an intracrystalline force regulation strategy to dynamically control cobalt spin states and enhance peroxymonosulfate(PMS)activation in Fenton-like processes.This approach utilizes BaTi_(0.92)Co_(0.08)O_(3-δ)(BTC-8)nano-ferroelectrics,where ultrasound irradiation generates a built-in electric field that drives electrons towards cobalt sites.This electron transfer is further facilitated by electronegativity differences between cobalt and barium/titanium ions.The resulting piezo-driven electron flow promotes continuous regeneration of high-spin Co^(2+),enhancing PMS adsorption and SO_(4)^(-)-OH bond cleavage,leading to increased production of⋅SO_(4)^(-)and singlet oxygen(^(1)O_(2))for organic pollutant degradation.Consequently,BTC-8 achieves a reaction rate(k=1.7960 min^(-1))28.93 times higher than that of pure barium titanate,surpassing previously reported PMS activation and piezocatalytic systems.This work represents a shift from static electronic structure design to dynamic electronic engineering in the development of advanced catalytic strategies for water remediation.
基金supported by the National Natural Science Foundation of China(grant no.52072041)the Beijing Natural Science Foundation(grant no.JQ21007).
文摘Ferroelectric film materials have attracted significant interest due to their potential for harvesting various forms ofclean energy from natural environmental sources.However,the photoelectric performance of these materials isfrequently constrained by heat generation during light absorption,resulting in significant thermal losses.Most offerroelectric films produce photocurrent and thermocurrent with opposite polarity,thus weakening the coupledphoto-thermoelectric output of the devices.Here we report on a LaNiO_(3)/BiMn_(2)O_(5)(BMO)/ITO ferroelectric film toproduce photocurrent and thermocurrent with the same polarity.The polarity of the photocurrent generated bythe BMO film is shown to be determined solely by the direction of spontaneous polarization,overcoming thedetrimental effect of Schottky barrier for energy harvesting in device.We propose a new strategy to enhance thecoupling factor,thereby offering valuable new insights for optimizing the utilization of ferroelectric materials inboth light and heat energy applications.
基金supports from the Scientific Research Foundation of Hunan Provincial Education Department(21A0188,24C0149)the National Natural Science Foundation of China(52400202)+3 种基金Engineering and Technical Center Open Fund of Hunan Provincial Environmental Protection for River-Lake Dredging Pollution Control(EPD202104)Natural Science Foundation of Hunan Province(2023JJ40028,2024JJ6058)Natural Science Foundation of Changsha City(kq2208232)Natural Science Foundation of Hunan Province(2023JJ40033).
文摘To address the global energy shortage,hydrogen production as a green energy source has become one of the most prominent research topics over the past decade.Novel and promising ferroelectric materials,exhibiting unique spontaneous polarization capabilities,have shown great potential in the field of photocatalytic hydrogen evolution.Among these materials,perovskites represent a significant group of ferroelectrics,possessing both excellent ferroelectric properties and photocatalytic performance.By focusing on perovskites,we analyze the advantages of their built-in electric field for photocatalytic hydrogen evolution,integrating the domain wall structures of ferroelectrics.Furthermore,we summarize how to fully exploit the unique characteristics of ferroelectrics and highlight recent advancements in their application to photocatalytic hydrogen evolution.
基金financial supported by National Natural Science Foundation of China(Nos.52303256,21991141,22375182)Natural Science Foundation of Zhejiang Province(Nos.LQ23B040004,LZ24B010001)Jinhua Industrial Major Project(No.2022-1-043)。
文摘Poly(vinylidene fluoride)(PVDF)based piezoelectric materials have received tremendous scientific attention for many decades.However,the high output power density remains a significant challenge and an area of intense interest.Herein,we present a piezoelectric sensor with high output power density by incorporating liquid metal(LM)microdroplets into PVDF piezoelectric substrate.Remarkably,the LM/PVDF composite showed theβ-phase content above 90%and the output power density is enhanced to 353μW/cm^(2),nearly 1000 times higher than that of pure PVDF materials and significantly surpassing other PVDF-based composite materials.These exceptional performances are attributed to two key factors:The formation of a liquid-solid/electric-dielectric interface between the LM and PVDF,and the incorporation of the LM's outstanding charge transfer capability.This work might present an effective strategy for advancing the utilization of PVDF-based piezoelectric materials in compelling applications within the realm of intelligent wearable electronics.
基金financially supported by the National Natural Science Foundation of China(Nos.22375182,92056112 and 21991141).
文摘The performance optimization of materials is an eternal theme and challenge in scientific research,which is reflected in ferroelectric filed to two hot topics of enhancing Curie temperature(TC)and functional versatility.The former one vitally determines ferroelectric operational temperature range while the latter would open up new application possibilities.Effective chemical modification or doping strategies on A-site and X-site components have been successfully developed in hybrid organic-inorganic perovskite(HOIP)ferroelectrics,however,the important role of adjusting B-site ions has long been overlooked.Here,we have implemented regulation on the ion radius of the B-site component to successfully obtain two new HOIP ferroelectrics(3-pyrrolinium)BBr_(3)(B=Mn and Ni).Compared to parent(3-pyrrolinium)CdBr_(3),the TC(△T=99 K)was significantly optimized by replacing the Cd^(2+)with smaller Mn^(2+)or Ni^(2+)ions.More strikingly,the introduction of Mn^(2+)and Ni^(2+)ions with octahedral coordination bring out intriguing red emission and magnetism respectively,making the multifunctional integration in a single material for multiple uses.This work provides a feasible strategy for performance optimizing of HOIP ferroelectrics,and would shed light for constructing multifunctional ferroelectrics.
基金financially supported by the National Natural Science Foundation of China(Nos.22435005,22193042,21921001,22305105,52202194,22201284)Natural Science Foundation of Jiangxi Province(No.20224BAB213003)+1 种基金the Natural Science Foundation of Fujian Province(No.2023J05076)Jiangxi Provincial Education Department Science and Technology Research Foundation(No.GJJ2200384)。
文摘Two-dimensional perovskite ferroelectric which strongly couple ferroelectricity with semiconducting properties are promising candidates for optoelectronic applications.However,it is still a great challenge to fabricate self-powered broadband photodetectors with low detection limit.Herein,we successfully realized self-powered broadband photodetection with low detection limit by using a trilayered perovskite ferroelectric(BA)_(2)EA_(2)Pb_(3)I_(10)(1,BA=n-butylamine,EA=ethylamine).Giving to its large spontaneous polarization(5.6μC/cm^(2)),1 exhibits an open-circuit voltage of 0.25 V which provide driving force to separate carriers.Combining with its low dark current(~10^(-14)A)and narrow bandgap(Eg=1.86 e V),1 demonstrates great potential on detecting the broadband weak lights.Thus,a prominent photodetection performance with high open-off ratio(~10^(5)),outstanding responsivity(>10 m A/W),and promising detectivity(>1011Jones),as well as the low detecting limit(~nW/cm^(2))among the wide wavelength from 377 nm to637 nm was realized based on the single crystal of 1.This work demonstrates the great potential of 2D perovskite ferroelectric on self-powered broadband photodetectors.
