A5027945800- Perovskite Materials and Applications
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Organic Light-Emitting Diodes Research
- Organic Electronics and Photovoltaics
- Chalcogenide Semiconductor Thin Films
- Thin-Film Transistor Technologies
- Solid-state spectroscopy and crystallography
- Luminescence and Fluorescent Materials
- Advanced Photocatalysis Techniques
- 2D Materials and Applications
- Nanowire Synthesis and Applications
- Molecular Junctions and Nanostructures
- Semiconductor materials and devices
- Semiconductor materials and interfaces
- Advanced Memory and Neural Computing
- Advanced Sensor and Energy Harvesting Materials
- Robot Manipulation and Learning
- Modular Robots and Swarm Intelligence
- Supercapacitor Materials and Fabrication
- Optical and Acousto-Optic Technologies
- Organic and Molecular Conductors Research
- Silicon Nanostructures and Photoluminescence
- Green IT and Sustainability
- Electrocatalysts for Energy Conversion
Soochow University
2016-2025
Tsinghua University
2024
California NanoSystems Institute
2019-2021
University of California, Los Angeles
2019-2021
Nanjing University of Posts and Telecommunications
2021
Suzhou Research Institute
2017-2019
Wuhan University
2018
Iowa State University
2017
Molina Center for Energy and the Environment
2014
University of Toyama
2009-2013
Surface trap-mediated nonradiative charge recombination is a major limit to achieving high-efficiency metal-halide perovskite photovoltaics. The ionic character of lattice has enabled molecular defect passivation approaches through interaction between functional groups and defects. However, lack in-depth understanding how the configuration influences effectiveness challenge rational molecule design. Here, chemical environment group that activated for was systematically investigated with...
Abstract The field of halide metal perovskite photovoltaics has caught widespread interest in the last decade. This is seen rapid rise power conversion efficiency, which currently over 23%. It also stimulated a application perovskites other fields, such as light‐emitting diodes, field‐effect transistors, detectors, and lasers. Despite fascinating characteristics perovskites, presence toxic lead (Pb) their chemical composition regarded one major limiting factors preventing commercialization....
A key issue for perovskite solar cells is the stability of materials due to moisture effects under ambient conditions, although their efficiency improved constantly. Herein, an CH 3 NH PbI 3− x Cl quality demonstrated with good crystallization and by using water as additive during crystal growth. Incorporating suitable additives in N , ‐dimethylformamide (DMF) leads controllable growth perovskites lower boiling point higher vapor pressure compared DMF. In addition, · n H 2 O hydrated...
Daily temperature variations induce phase transitions and lattice strains in halide perovskites, challenging their stability solar cells. We stabilized the perovskite black improved cell performance using ordered dipolar structure of β-poly(1,1-difluoroethylene) to control film crystallization energy alignment. demonstrated p-i-n cells with a record power conversion efficiency 24.6% over 18 square millimeters 23.1% 1 centimeter, which retained 96 88% after 1000 hours 1-sun maximum point...
Compared to efficient green and near-infrared light-emitting diodes (LEDs), less progress has been made on deep-blue perovskite LEDs. They suffer from inefficient domain [various number of PbX6- layers (n)] control, resulting in a series unfavorable issues such as unstable color, multipeak profile, poor fluorescence yield. Here, strategy involving delicate spacer modulation for quasi-2D films via an introduction aromatic polyamine molecules into the precursor is reported. With...
Addressing the toxicity issue in lead-based perovskite compounds by seeking other nontoxic candidate elements represents a promising direction to fabricate lead-free solar cells. Recently, Cs2AgBiBr6 double achieved replacing two Pb2+ with Ag+ and Bi3+ crystal lattice has drawn much attention owing convenient substitution of its chemical compositions. Herein, dependence optoelectronic properties corresponding photovoltaic performance thin films on deposition methods vacuum sublimation...
A-sites join the band edge The of hybrid organic-inorganic perovskites, which have general formula ABX 3 , is mainly controlled by inorganic X anions (such as chloride) and B cation lead). Organic A-site cations usually only exert indirect structural effects because their electronic levels lie far from edge. Xue et al. show that with large π-conjugated structures can interact frontier molecular orbitals. A surface layer ethylammonium pyrene, had an optimal intercalation distance, increased...
Abstract Organometallic halide perovskite films with good surface morphology and large grain size are desirable for obtaining high‐performance photovoltaic devices. However, defects related trap sites generated inevitably at boundaries on surfaces of solution‐processed polycrystalline films. Seeking facial efficient methods to passivate the film minimizing defect density is necessary further improving performance. Here, a convenient strategy developed improve crystallization by incorporating...
Abstract Organic–inorganic hybrid perovskite solar cells (PSCs) are currently attracting significant interest owing to their promising outdoor performance. However, the ability of indoor light harvesting perovskites and corresponding device performance rarely reported. Here, potential planar PSCs in for low‐power consumption devices is investigated. Ionic liquid 1‐butyl‐3‐methylimidazolium tetrafluoroborate ([BMIM]BF 4 ) employed as a modification layer [6,6]‐phenyl‐C61‐butyric acid methyl...
Mixed Pb–In perovskite solar cells are fabricated by using lead(II) chloride and indium(III) with methylammonium iodide. A maximum power conversion efficiency as high 17.55% is achieved owing to the quality of perovskites multiple ordered crystal orientations. As a service our authors readers, this journal provides supporting information supplied authors. Such materials peer reviewed may be re-organized for online delivery, but not copy-edited or typeset. Technical support issues arising...
The development of effective and stable hole transporting materials (HTMs) is very important for achieving high‐performance planar perovskite solar cells (PSCs). Herein, copper salts (cuprous thiocyanate (CuSCN) or cuprous iodide (CuI)) doped 2,2,7,7‐tetrakis( N , ‐di‐ p ‐methoxyphenylamine)‐9,9‐spirobifluorene (spiro‐OMeTAD) based on a solution processing as the HTM in PSCs demonstrated. incorporation CuSCN (or CuI) realizes p‐type doping with efficient charge transfer complex, which...
Surface effects usually become negligible on the micrometer or sub-micrometer scale due to lower surface-to-bulk ratio compared nanomaterials. In lead halide perovskites, however, their "soft" nature renders them highly responsive external field, allowing for extended depth affected by surface. Herein, taking advantage of this unique feature perovskites we demonstrate a methodology property manipulation perovskite thin films based secondary grain growth, where tuning surface induces internal...
Abstract The chemical composition engineering of lead halide perovskites via a partial or complete replacement toxic Pb with tin has been widely reported as feasible process due to the suitable ionic radius Sn and its possibility existing in +2 state. Interestingly, narrows bandgap while gives an anomalous phenomenon involving further narrowing relative pure perovskite compounds. Unfortunately, merits this behavior have not properly harnessed. Although promising progress made advance...
The inorganic lead-free Cs2AgBiBr6 double perovskite structure is the promising development direction in solar cells (PSCs) to solve problem of instability APbX3 and lead toxicity. However, low short-circuit current power conversion efficiency (PCE) caused by crystallization greatly limit optoelectronic application. Herein, we adopt a simple strategy dope single-layered MXene nanosheets into titania (Ti3C2Tx@TiO2) as multifunctional electron transport layer for stable efficient PSCs....
All-inorganic-based perovskites achieved by replacing the organic component with cesium (Cs) have drawn more attention because of their intrinsic inorganic stability. However, cell efficiency in all-inorganic perovskite solar cells is still far below that organic-inorganic hybrid perovskite-based devices. Here, we develop a new strategy to mediate CsPbI2Br crystallization directly doping copper(II) bromide (CuBr2) into precursor. The incorporation CuBr2 played role retarding dynamics process...
Full inorganic cesium lead halide perovskites (IOPs) are regarded as attractive candidates for light-emitting diodes (LEDs) by their excellent luminescent conversion. However, unsatisfactory efficiency and stability still the main drawbacks that hinder commercialization progress of perovskite LEDs (PeLEDs). Here, we report an extremely uniform flat CsPbBr3 film composing self-assembly core-shell structured quantum dots (SCQDs) based on one-step precursor coating. The QDs size in is around...
Halide perovskites are a strong candidate for the next generation of photovoltaics. Chemical doping halide is an established strategy to prepare highest efficiency and most stable perovskite-based solar cells. In this study, we unveil mechanism using series alkaline earth metals. We find that low levels enable incorporation dopant within perovskite lattice, whereas high concentrations induce surface segregation. The threshold from regime correlates size element. show results in more n-type...
Abstract Tin halide perovskites attract incremental attention to deliver lead‐free perovskite solar cells. Nevertheless, disordered crystal growth and low defect formation energy, related Sn(II) oxidation Sn(IV), limit the efficiency stability of Engineering processing from precursor solution preparation film crystallization is crucial tackle these issues enable full photovoltaic potential tin perovskites. Herein, ionic liquid n ‐butylammonium acetate (BAAc) used tune coordination with...
Abstract Interface strains and lattice distortion are inevitable issues during perovskite crystallization. Silane as a coupling agent is popular connector to enhance the compatibility between inorganic organic materials in semiconductor devices. Herein, protonated amine silane (PASCA‐Br) interlayer TiO 2 layers adopted directionally grasp both of them by forming structural component unit. The pillowy alkyl ammonium bromide terminals at upper side provide well‐matched growth sites for...
In hybrid organic-inorganic lead halide perovskite solar cells, the energy loss is strongly associated with nonradiative recombination in layer and at cell interfaces. Here, a simple but effective strategy developed to improve performance of cells via combination internal doping by ferroelectric polymer external control an electric field. A group polarized (PFE) polymers are doped into methylammonium iodide (MAPbI3 ) and/or inserted between hole-transporting layers enhance build-in field...
Abstract Metal halide perovskite semiconductors have demonstrated remarkable potentials in solution‐processed blue light‐emitting diodes (LEDs). However, the unsatisfied efficiency and spectral stability responsible for trap‐mediated non‐radiative losses phase segregation remain primary unsolved challenges LEDs. In this study, it is reported that a fluorene‐based π‐conjugated cationic polymer can be blended with semiconductor to control film formation optoelectronic properties. As result,...
Perovskite photovoltaics are strong potential candidates to drive low-power off-grid electronics for indoor applications. Compared with rigid devices, flexible perovskite devices can provide a more suitable surface small electronic enabling them have broader application prospect. However, the mechanical stability of is an urgent issue solved. Herein, kind 3D crosslinking agent named borax selected carry out grain boundary penetration treatment on film realize full-dimensional stress release....