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lead halide perovskite sensitized WSe_(2) photodiodes with ultrahigh open circuit voltages

eLight 2023年第1期3卷 188-197页

作者： Sung-Joon Lee Hung-Chieh Cheng Yiliu Wang Boxuan Zhou Dehui Li Gongming Wang Yuan Liu Jian Guo Hao Wu Dae Joon Kang Yu Huang Xiangfeng Duan Department of Materials Science and Engineering University of CaliforniaLos AngelesCAUSA Department of Physics Sungkyunkwan UniversitySuwonRepublic of Korea Department of Chemistry and Biochemistry University of CaliforniaLos AngelesCAUSA Present Address:Materials Science and Technology Division U.S.Naval Research LaboratoryWashingtonDCUSA

Two-dimensional semiconductors(2DSCs)have attracted considerable interests for optoelectronic devices,but are often plagued by the difficulties in tailoring the charge doping type and poor optical absorption due to their atomically thin ***,we report a methylammonium lead iodide perovskite(CH_(3)NH_(3)PbI_(3))/2DSC heterojunction device,in which the electric-field controllable ion migration in the perovskite layer is exploited to induce reversible electron-and hole-doping effects in the underlying monolayer tungsten diselenide(WSe_(2))to form a programmable p-n *** the same time,the CH_(3)NH_(3)PbI_(3) layer functions as a highly efficient sensitization layer to greatly boost the optical absorption and external quantum efficiency(EQE)of the resulting *** asymmetrically poling the perovskite layer,gold-contacted CH_(3)NH_(3)PbI_(3)/WSe_(2) devices show a switchable open circuit voltage up to 0.78 V,along with a high EQE of 84.3%.The integration of tunable graphene-contacts further improves the photodiode performance to achieve a highest open circuit voltage of 1.08 V and a maximum EQE of 91.3%,greatly exceeding those achieved previously in 2DSC lateral *** studies establish a non-invasive approach to switch optoelectronic functions and open up a new avenue toward high-performance reconfigurable optoelectronic devices from 2DSCs.

关键词： Electrostatic doping Programmable optoelectronic devices lead halide perovskite Two-dimensional

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Large-area periodic lead halide perovskite nanostructures for lenticular printing laser displays

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Science China Chemistry 2021年第4期64卷 629-635页

作者： Min Wang Haohao Li Chenghu Dai Ji Tang Baipeng Yin Hong Wang Jingwen Li Yuchen Wu Chuang Zhang Yong Sheng Zhao Key Laboratory of Photochemistry Beijing National Laboratory for Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Bio-inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Lenticular printing technique provides a promising way to realize stereoscopic displays,especially,when microscopic optical structures are integrated into light-emitting materials/***,we fabricated large-area periodic structures with a spatial resolution at a wavelength scale from hybrid perovskite materials via a space-confined solution growth *** takes advantages of both high refractive index contrast and high luminescence brightness,which allows the optical modulation on not only the reflection of illumination,but also the light emission from hybrid *** distributed feedback within these periodic structures significantly improves the degree of polarization and directionality of laser actions while their threshold is also *** findings enable us to present a prototype of lenticular printing laser displays that vary emission colors at different view angles,which may find applications in creating high-resolution and high-contrast holographical images.

关键词： lead halide perovskite optical grating structure optically pumped laser lenticular printing laser display

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Efficient up-conversion photoluminescence in all-inorganic lead halide perovskite nanocrystals

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Nano Research 2020年第7期13卷 1962-1969页

作者： Andres Granados del Aguila TThu Ha Do Jun Xing Wen Jie Jee Jacob B.Khurgin Qihua Xiong Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological UniversitySingapore 637371Singapore Key Laboratory of Eco-Chemical Engineering Ministry of EducationCollege of Chemistry and Molecular EngineeringQingdao University of Science and TechnologyQingdao 266042China Department of Electrical and Computer Engineering Johns Hopkins UniversityBaltimoreMaryland 21218USA State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China

Up-conversion photoluminescence(UCPL)refers to the elementary process where low-energy photons are converted into high-energy ones via consecutive interactions inside a *** additional energy is provided by intermnal thermal energy in the form of lttice vibrations(phonons),the process is called phonon-assisted ***,we report the exceptionally large phonon-assisted energy gain of up to^8kgT(kg is Boltzmann constant,T is temperature)on all-inorganic lead halide perovskite semiconductor colloidal nanocrystals that goes beyond the maximum capabilty of only harvesting optical phonon *** systematic optical study in combination with a statistical probability model,we explained the nontrivial phonon-assisted UCPL process in perovskites nanocrystals,where in addition to the strong electron-phonon(light-matter)coupling,other nonlinear processes such as phonon-phonon(matter-matter)interaction also effectively boost the up-conversion efficiency.

关键词： up-conversion photoluminescence phonons lead halide perovskite colloidal nanocrystals

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lead halide perovskite Nanocrystals Embedded in Hollow Siliceous Nanospheres and Polyvinylidene Fluoride with Enhanced Stability in Polar Media

Lead Halide Perovskite Nanocrystals Embedded in Hollow Silic...

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中国化学会第十三届全国分析化学年会

作者： Yipeng Huang Feiming Li Fangyuan Lin Xi Chen Department of Chemistry and the MOF Key Laboratory of Spectrochemical Analysis ＆Instrumentation College of Chemistry and Chemical Engineering Xiamen University

The poor stability of lead halide perovskite nanocrystals（LHP NC） in polar solvents has always been the biggest challenge since its birth, and this problem has tremendously hindered the applications of LHP NCs in many fields[1,2]. To address this problem, LHP NCs embedded in hollow siliceous nanospheres and polyvinylidene fluoride（LHP NCs@HSNs/PVDF） have been synthesized. The hydrophobic LHP NCs@HSNs/PVDF shows strong repulsion to water, and the photoluminescence of LHP NCs@HSNs/PVDF can be retained in ethanol longer than 2 weeks. The polar solvent resisted properties enable the surface processes of LHP NCs@HSNs/PVDF in some common solvents, and this may open an avenue for the applications of LHP NCs in fluorescence imaging, drug delivery and release, sensing, catalysis, etc.

关键词： lead halide perovskite Hollow siliceous nanosphere Polyvinylidene fluoride Polar solvent

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Diffusion effect on the decay of time-resolved photoluminescence under low illumination in lead halide perovskites

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Science China(Physics,Mechanics & Astronomy) 2023年第8期66卷 115-124页

作者： Huang Li Haipeng Di Xingan Wang Zefeng Ren Ming Lu An-An Liu Xueming Yang Nanlin Wang Yiying Zhao Bohan Li Department of Chemical Physics University of Science and Technology of ChinaHefei 230026China Institute of Materials China Academy of Engineering PhysicsJiangyou 621908China Beijing Academy of Quantum Information Sciences Bejing 100193China International Center for Quantum Materials School of PhysicsPeking UniversityBejing 100871China State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China

Time-resolved photoluminescence(TRPL)has been extensively used to measure the carrier lifetime in lead halide *** TRPL curves of perovskite materials are usually fitted with a multi-exponential function,instead of a single exponential *** was considered to be a result of the surface and the bulk recombination or the additional radiative recombination caused by the high excited carrier ***,a new model considering the diffusion and the trap-assisted recombination of carriers is proposed to explain the TRPL *** expressions of the TRPL curves and the transient absorption(TA)dynamic curves are theoretically derived,demonstrating that the TRPL curve is an infinite exponential series,regardless of the presence of surface recombination or *** newly developed highly sensitive nanosecond TA and TRPL were employed to measure the carrier dynamics of the same sample under low illumination in the linear response region of TA,thereby experimentally verifying our *** results suggest that the decay of the TRPL is not only a consequence of the carrier recombination but also the carrier *** cannot provide a direct measurement of the carrier lifetime,whereas TA spectroscopy ***,the surface and the bulk recombination can be resolved and the average diffusion coefficient(D)can also be correctly obtained by combining TRPL and TA *** also propose an approximate method for calculating the carrier lifetime and diffusion coefficient of high-quality perovskite *** model provides not only a new interpretation of the dynamics of the PL decay but also a deep insight into the carrier dynamics in the nanosecond time scale under working condition of perovskites solar cells.

关键词： time-resolved photoluminescence(TRPL) lead halide perovskite carrier diffusion ultrafast carrier dynamics

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Material exploration via designing spatial arrangement of octahedral units: a case study of lead halide perovskites

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Frontiers of Optoelectronics 2021年第2期14卷 252-259页

作者： Pengfei FU Sanlue HU Jiang TANG Zewen XIAO Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China School of Physics Huazhong University of Science and TechnologyWuhan 430074China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China

halide perovskites have attracted tremendous attention as semiconducting materials for various optoelectronic *** functional metal-halide octahedral units and their spatial arrangements play a key role in the optoelectronic properties of these *** present,most of the efforts for material exploration focus on substituting the constituent elements of functional octahedral units,whereas designing the spatial arrangement of the functional units has received relatively little *** this work,via a global structure search based on density functional theory(DFT),we discovered a metastable three-dimensional honeycomb-like perovskite structure with the functional octahedral units arranged through mixed edge-and *** experimentally confirmed that the honeycomb-like perovskite structure can be stabilized by divalent molecular cations with suitable size and shape,such as 2,2’-bisimidazole(BIM).DFT calculations and experimental characterizations revealed that the honeycomb-like perovskite with the formula of BIMPb2l6,synthesized through a solution process,exhibits high electronic dimensionality,a direct allowed bandgap of 2.1 eV,small effective masses for both electrons and holes,and high optical absorption coefficients,which indicates a significant potential for optoelectronic *** employed combination of DFT and experimental study provides an exemplary approach to explore prospective optoelectronic semiconductors via spatially arranging functional units.

关键词： lead halide perovskite electronic dimensionality functional octahedral units optoelectronic properties photodetector

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Single-atom sites on perovskite chips for record-high sensitivity and quantification in SERS

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Science China Materials 2022年第6期65卷 1601-1614页

作者： Ran Feng Qing Miao Xiang Zhang Peixin Cui Cong Wang Yibo Feng Liyong Gan Jiaxing Fu Shibo Wang Ziyi Dai Liming Hu Yunjing Luo Weihai Sun Xiaoxian Zhang Jiawen Xiao Jinbo Wu Bingpu Zhou Mingqiang Zou Dawei He Xiaoyuan Zhou Xiaodong Han Beijing Key Laboratory of Microstructure and Properties of Solids Institute of Microstructure and Property of Advanced MaterialsFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Key Laboratory of Luminescence and Optical Information Ministry of EducationInstitute of Optoelectronic TechnologyBeijing Jiaotong UniversityBeijing 100044China College of Physics and Center for Quantum Materials and Devices Analytical and Testing CenterChongqing UniversityChongqing 401331China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008China Faculty of Environment and Life Beijing Key Laboratory of Environmental and OncologyBeijing University of TechnologyBeijing 100124China Materials Genome Institute Shanghai UniversityShanghai 200444China College of Materials science and Engineering Huaqiao UniversityXiamen 361021China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacao 999078China Chinese Academy of Inspection and Quarantine(CAIQ) Beijing 100123China

Surface enhanced Raman scattering(SERS)is a rapid and nondestructive technique that is capable of detecting and identifying chemical or biological *** SERS quantification is vital for practical applications,particularly for portable detection of biomolecules such as amino acids and ***,few approaches can achieve sensitive and quantitative Raman detection of these most fundamental components in ***,a noblemetal-free single-atom site on a chip strategy was applied to modify single tungsten atom oxide on a lead halide perovskite,which provides sensitive SERS quantification for various analytes,including rhodamine,tyrosine and *** single-atom site on a chip can enable quantitative linear SERS responses of rhodamine(10^(−6)-1 mmol L^(−1)),tyrosine(0.06-1 mmol L^(−1))and cytosine(0.2-45 mmol L^(−1)),respectively,which all achieve record-high enhancement factors among plasmonic-free *** experimental test and theoretical simulation both reveal that the enhanced mechanism can be ascribed to the controllable single-atom site,which can not only trap photoinduced electrons from the perovskite substrate but also enhance the highly efficient and quantitative charge transfer to ***,the label-free strategy of single-atom sites on a chip can be applied in a portable Raman platform to obtain a sensitivity similar to that on a benchtop instrument,which can be readily extended to various biomolecules for low-cost,widely demanded and more precise point-of-care testing or in-vitro detection.

关键词： SERS single-atom site point-of-care testing in-vitro diagnosis charge-transfer mechanism lead halide perovskite

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Mediating the Local Oxygen‑Bridge Interactions of Oxysalt/perovskite Interface for Defect Passivation of perovskite Photovoltaics

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Nano-Micro Letters 2021年第11期13卷 266-279页

作者： Ze Qing Lin Hui Jun Lian Bing Ge Ziren Zhou Haiyang Yuan Yu Hou Shuang Yang Hua Gui Yang Key Laboratory for Ultrafine Materials of Ministry of Education Shanghai Engineering Research Center of Hierarchical NanomaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237People’s Republic of China

Passivation,as a classical surface treatment technique,has been widely accepted in start-of-the-art perovskite solar cells(PSCs)that can effectively modulate the electronic and chemical property of defective perovskite *** discovery of inorganic passivation compounds,such as oxysalts,has largely advanced the efficiency and lifetime of PSCs on account of its favorable electrical property and remarkable inherent stability,but a lack of deep understanding of how its local configuration affects the passivation effectiveness is a huge impediment for future interfacial molecular ***,we demonstrate the central-atom-dependent-passivation of oxysalt on perovskite surface,in which the central atoms of oxyacid anions dominate the interfacial oxygen-bridge *** revealed that the balance of local interactions between the central atoms of oxyacid anions(e.g.,N,C,S,P,Si)and the metal cations on perovskite surface(e.g.,Pb)generally determines the bond formation at oxysalt/perovskite interface,which can be understood by the bond order conservation *** with less electronegative Si central atoms provides strong O-Pb motif and improved passivation effect,delivering a champion efficiency of 17.26%for CsPbI2Br solar *** strategy is also universally effective in improving the device performance of several commonly used perovskite compositions.

关键词： Solar cell lead halide perovskite Passivation Oxysalt Central atom

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