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Enhancing the Performance of Perovskite Light-Emitting Diodes via Synergistic Effect of Defect Passivation and Dielectric Screening

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Nano-Micro Letters 2024年第10期16卷 244-256页

作者： Xuanchi Yu Jia Guo Yulin Mao Chengwei Shan Fengshou Tian Bingheng Meng Zhaojin Wang Tianqi Zhang Aung Ko Ko Kyaw Shuming Chen Xiaowei Sun Kai Wang Rui Chen guichuan xing Institute of Applied Physics and Materials Engineering University of MacaoAvenida da UniversidadeTaipaMacao 999078People's Republic of China Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055People's Republic of China

Metal halide perovskites,particularly the quasi-two-dimensional perovskite subclass,have exhibited considerable potential for next-generation electroluminescent materials for lighting and ***,the presence of defects within these perovskites has a substantial influence on the emission efficiency and durability of the *** this study,we revealed a synergistic passivation mechanism on perovskite films by using a dual-functional compound of potassium *** dual functional potassium bromide on the one hand can passivate the defects of halide vacancies with bromine anions and,on the other hand,can screen the charged defects at the grain boundaries with potassium *** approach effectively reduces the probability of carriers quenching resulting from charged defects capture and consequently enhances the radiative recombination efficiency of perovskite thin films,leading to a significant enhancement of photoluminescence quantum yield to near-unity values(95%).Meanwhile,the potassium bromide treatment promoted the growth of homogeneous and smooth film,facilitating the charge carrier injection in the ***,the perovskite light-emitting diodes based on this strategy achieve a maximum external quantum efficiency of~21%and maximum luminance of~60,000 cd m^(-2).This work provides a deeper insight into the passivation mechanism of ionic compound additives in perovskite with the solution method.

关键词： Synergistic passivation strategy Defects passivation Dielectric screening Perovskite light-emitting diodes

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Benzothiadiazole-based materials for organic solar cells

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Chinese Chemical Letters 2024年第1期35卷 3-15页

作者： Qiang Bei Bei Zhang Kaifeng Wang Shiming Zhang guichuan xing Clément Cabanetos Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)Nanjing Tech UniversityNanjing 211816China Jiangsu Seenbom Flexible Electronics Institute Co. Ltd.Nanjing 210043China Institute of Applied Physics and Materials Engineering University of MacaoMacao SAR 999078China University of Angers Angers 49045France Building Blocks for Future Electronics Laboratory(2BFUEL) IRL2002CNRS-Yonsei UniversitySeoul 03722Republic of Korea

The past few years have witnessed power conversion efficiency(PCE)of organic solar cells(OSCs)skyrocketing to the value of 20%due to the outstanding advantages of organic photoactive *** latter,which consist of donor and acceptor materials,indeed play important roles in OSCs,and particularly one building block has attracted considerable research attention,namely benzothiadiazole(BT).The diversity of OSCs based on the BT structure have indeed sprung up,and the progressive increase in PCE values is more than just eye-catching since it heralds a renewal and bright future of *** review analyzes significant studies that have led to these remarkable progresses and focuses on the most effective BT small-molecules and BT polymers for OSC reported in the last *** pivotal structure-property relationships,donor-acceptor matching criteria,and morphology control approaches are gathered and discussed in this ***,we summarize the remaining challenges and offer a personal perspective on the future advance and improvement of OSCs.

关键词： Organic solar cells Benzothiadiazole Donor Acceptor Polymer Non-fullerene acceptors

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Homogeneous permeation and oriented crystallization in nanostructured mesopores for efficient and stable printable mesoscopic perovskite solar cells

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Science China Chemistry 2024年

作者： Guodong Zhang Yanjie Cheng Tingting Niu Ziwei Zheng Zongwei Li Junwei Xiang Qiaojiao Gao Minghao Xia Lijuan Guo Yiming Liu Mengru Zhang Yiran Tao Xueqin Ran Mingjie Li guichuan xing Yingdong Xia Lingfeng Chao Anyi Mei Hongwei Han Yonghua Chen Key Laboratory of Flexible Electronics (KLoFE) and Institute of Advanced Materials (IAM) School of Flexible Electronics (Future Technologies) Nanjing Tech University Michael Gr?tzel Center for Mesoscopic Solar Cells Wuhan National Laboratory for Optoelectronics Key Laboratory of Materials Chemistry for Energy Conversion and Storage of Ministry of Education Huazhong University of Science and Technology Department of Physics The Chinese University of Hong Kong Department of Applied Physics The Hong Kong Polytechnic University Shenzhen Research Institute The Hong Kong Polytechnic University Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau

The low-cost and scalable printable mesoporous perovskite solar cells(p-MPSCs) face significant challenges in regulating perovskite crystal growth due to their nanoscale mesoporous scaffold structure, which limits the improvement of device power conversion efficiency(PCE). In particular, the most commonly used solvents, N,N-dimethylformamide(DMF) and dimethyl sulfoxide(DMSO), have a single chemical interaction with the precursor components and high volatility, which is insufficient to self-regulate the perovskite crystallization process, leading to explosive nucleation and limited growth within mesoporous scaffolds. Here, we report a mixed solvent system composed of methylamine formaldehyde(MAFa)-based ionic liquid and acetonitrile(ACN) with the strong C=O–Pb coordination and N–H···I hydrogen bonding with perovskite components. We found that the mixed solvent system is beneficial for the precursor solution to homogeneously penetrate into the mesoporous scaffold,and the strong C=O–Pb coordination and N–H···I hydrogen bonding interaction can promote the oriented growth of perovskite crystals. This synergistic effect increased the PCE of the p-MPSCs from 17.50% to 19.21%, which is one of the highest records for p-MPSC in recent years. Additionally, the devices exhibit positive environmental stability, retaining over 90% of the original PCE after 1,200 h of aging under AM 1.5 illumination conditions at 55 °C and 55% humidity.

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Self-assembly Behavior of Metal Halide Perovskite Nanocrystals

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Chinese Journal of Chemistry 2022年第18期40卷 2239-2248页

作者： Zhuoying Yang Shaomin Peng Fan Lin Pengfei Wang guichuan xing Lin Yu Key Laboratory of Clean Chemistry Technology of Guangdong Regular Higher Education Institutions Guangdong Provincial Key Laboratory of Plant Resources BiorefinerySchool of Chemical Engineering and Light IndustryGuangdong University of TechnologyGuangzhouGuangdong510006 China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoSAR999078 China

The self-assembled metal halide perovskite(MHP)nanocrystal superlattices have attracted many researchers due to their exceptional optical and electrical *** bottom-up self-assembly can be facile to generate ideal and periodic *** superlattices’stability can be improved and the photoluminescence lifetime can be extended by an order of ***,due to lack of a comprehensive and systematic understanding of the internal interactions on self-assembled processes now,superlattices cannot be obtained controllably and play full use of their ***,gaining a deep insight of interaction forces about self-assemblies is the premise of designing and controlling the degree of self-assembly so as to prepare ideal *** this review,the definitions and functions of driving forces including van der Waals forces,electrostatic interactions and hydrogen bonds are ***,we aim to explore the dominant factors affecting the driving forces,which can make a difference in the process of MHP *** on current researches,we emphasize on three aspects−the core of nanocrystals,surface ligands and solvents−to clarify their critical roles in controlling the driving ***,the outlooks and perspectives of how to facilitate the MHP self-assembly and their application on blue light emitting diodes are discussed.

关键词： Metal halide perovskite Self assembly Nanostructures Surface ligand|Solvent effects

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Full-color-tunable phosphorescence of antimony-doped lead halide single crystal

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npj Flexible Electronics 2022年第1期6卷 613-620页

作者： Jin-Feng Liao Zhipeng Zhang Bingzhe Wang Zikang Tang guichuan xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipaMacao 999078China

Although multiple emissive phosphors are of great fundamental interest and practical importance,it is still challenging to achieve full-color tunable luminescence in a single-component ***,we present an antimony-doped lead halide single crystal(C10NH22)2PbBr4:Sb3+with widely tunable red/green/blue/white *** Sb3+dopants provide host another active sites to capture photo-generated excitons,thus triggering blue/red dual ***,a reversible thermal-induced phase transition transforms blue/red emission into green/red dual *** two phases exhibit intriguing excitation-wavelength dependent emission,affording a whole color gamut covering the red-green-blue(RGB)color triangle on the CIE 1931 *** and theoretical calculation studies reveal two emitters work independently,which paves the way for the multimode optical control and promotes the development of multifunctional luminescent materials.

关键词： tunable dopant crystal

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Surface Passivation Toward Efficient and Stable Perovskite Solar Cells

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Energy & Environmental Materials 2023年第1期6卷 1-24页

作者： Junmin Xia Chao Liang Hao Gu Shiliang Mei Shengwen Li Nan Zhang Shi Chen Yongqing Cai guichuan xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipa China

Although metal halide perovskites are increasingly popular for the next generation of efficient photovoltaic devices,the inevitable defects from the preparation process have become the notorious barrier to further improvement of performance,which increases non-radiative recombination and lowers the power conversion efficiency of solar *** passivation strategies have been affirmed as one of the most practical approaches to suppress these ***,it is necessary to have a detailed review on the surface passivation to reveal the improvements of the ***,the mechanism and recent advances of surface passivation have been systematically summarized with respect to various passivation approaches,including the Lewis acid–base,the low-dimensional perovskite,inorganic molecules,and ***,the review also offers the research trend and prospects of surface passivation.

关键词： defects efficiency perovskite solar cells stability surface passivation

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Stabilizing wide-bandgap halide perovskites through hydrogen bonding

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Science China Chemistry 2022年第8期65卷 1650-1660页

作者： Lei Tao Xiaoqin Du Jianfei Hu Shixuan Wang Chen Lin Qi Wei Yingdong Xia guichuan xing Yonghua Chen Key Laboratory of Flexible Electronics(KLOFE)&Institution of Advanced Materials(IAM) Nanjing Tech University(Nanjing Tech)Nanjing 211816China Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials Engineering University of MacaoMacao SAR 999078China

Wide-bandgap(WBG)perovskites have emerged as promising materials for the construction of perovskite/silicon tandem solar ***,poor long-term operational stability due to the notorious photo-induced halide segregation is commonly ***,we report the synthesis of stable~1.73 eV MA-based mixed I/Br WBG perovskites by ionic liquid solvent,methylammonium acetate(MAAc).The special internal hydrogen bond(N–H…I and N–H…Br)environment in the ionic liquid MAAc solvent over traditional N,N-dimethylformamide/dimethyl sulfoxide solvent stabilizes the diffusion of halide *** allows the suppression of the halide segregation in the mixed I/Br WBG perovskite film,which is previously suggested to be *** hydrogen bonds also enable excellent decoupling of the crystal nucleation and growth ***,a champion device efficiency of 20.59%is achieved,which is one of the highest reports,with improved ambient air,heat,and light stability.

关键词： wide-bandgap perovskite hydrogen bonds perovskite solar cells ionic liquid

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Doping Electron Transporting Layer:An Effective Method to Enhance J_(SC)of All-Inorganic Perovskite Solar Cells

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Energy & Environmental Materials 2021年第4期4卷 500-501页

作者： Chao Liang guichuan xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacaoChina

All-inorganic metal-halide CsPbBr_(3)perovskite has emerged as an attractive photovoltaic material for its outstanding environmental ***,due to the wide bandgap,the performance of CsPbBr_(3)perovskite solar cells(PSCs)is limited,especially for the short-circuit current density(J_(SC)).In this issue of Energy&Environmental Materials,Guo et *** Nb-doped SnO_(2)as electron transporting layers(ETLs),which could greatly improve the J_(SC)of the PSCs based on all-inorganic CsPbBr_(3).

关键词： all-inorganic perovskite depletion region width doping planar heterojunction

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Overcoming the Limitation of Cs_(2)AgBiBr_(6) Double Perovskite Solar Cells Through Using Mesoporous TiO_(2) Electron Extraction Layer

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Energy & Environmental Materials 2022年第4期5卷 1317-1322页

作者： Dandan Zhao Chao Liang Bingzhe Wang Tanghao Liu Qi Wei Kaiyang Wang Hao Gu Sisi Wang Shiliang Mei guichuan xing Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipa Macao 999078China

Lead-free double perovskite Cs_(2)AgBiBr_(6) has gained increasing attention ***,the power conversion efficiency(PCE)of Cs_(2)AgBiBr_(6) perovskite solar cells(PSCs)is still low compared with their lead-based ***,by using photoluminescence(PL),time-resolved photoluminescence(TRPL),and ultrafast transient absorption(TA)measurements,the unbalance between the electron and hole in diffusion and transfer,which limits the performance of the Cs_(2)AgBiBr_(6) PSCs,was further *** this issue,a strategy of using the mesoporous TiO_(2) electron transport layer(ETL)to construct a bulk heterojunction in Cs_(2)AgBiBr_(6) PSCs was ***,the PCE had improved by over 24%comparing with that only used compact TiO_(2) ***,based on mesoporous TiO_(2),the unencapsulated Cs_(2)AgBiBr_(6) PSCs maintained 90%of their initial performance after approximately 1200 h of storage in a desiccator(humidity~30%).This work gives further understanding of Cs_(2)AgBiBr_(6) perovskite and demonstrates that a proper design of balancing the electron and hole diffusion can improve device performance.

关键词： bulk heterostructure charge carrier dynamics Cs_(2)AgBiBr_(6) lead-free double perovskite solar cells

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One step synthesis of efficient red emissive carbon dots and their bovine serum albumin composites with enhanced multi-photon fluorescence for in vivo bioimaging

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Light(Science & Applications) 2022年第5期11卷 955-968页

作者： Huiqi Zhang Gang Wang Zhiming Zhang Josh Haipeng Lei Tzu-Ming Liu guichuan xing Chu-Xia Deng Zikang Tang Songnan Qu Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoMacao 999078China Institute of Translational Medicine Faculty of Health SciencesUniversity of MacaoMacao 999078China MoE Frontiers Science Center for Precision Oncology University of MacaoMacao 999078China Cancer Center Faculty of Health SciencesUniversity of MacaoMacao 999078China

Efficient red emissive carbon dots(CDs)in aqueous solutions are very scarce for high performance bioimaging *** this work,we report a one-step solvothermal treatment to synthesize pure red emissive CDs(FA-CDs)from citric acid and urea in formic acid without complicated purification *** quantum yield(PLQY)of 43.4%was observed in their dimethyl sulfoxide *** PLQY up to 21.9%in aqueous solutions was achieved in their bovine serum albumin(BSA)composites(FA-CDs@BSA)with significantly enhanced multiphoton *** strong surface electron-withdrawing structure of FA-CDs caused by the high content of C=O groups contributes for their pure red *** to the significantly enhanced single and multi-photon red fluorescence and enlarged particle sizes after composing with BSA,in vivo tumor imaging and two-photon fluorescence imaging of blood vessels in mouse ear have been realized via intravenous injection of FA-CDs@BSA aqueous solutions.

关键词： photon pure synthesis

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