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Bifunctional passivation by lewis-base molecules for efficient printable mesoscopic perovskite solar cells

Journal of Energy Chemistry 2024年第9期96卷 177-184页

作者： Hang Yang Jianhong Zhao Xiaodong Ren Tong Zhou Henbing zhang Weilong zhang Jin zhang Guangzhi Hu Yuming zhang wen-hua zhang Qingju Liu Yunnan Key Laboratory for Micro/Nano Materials & Technology National Center for International Research on Photoelectric and Energy Materials School of Materials and Energy Yunnan UniversityKunming 650091YunnanChina Institute for Ecological Research and Pollution Control of Plateau Lakes School of Ecology and Environmental Science Yunnan UniversityKunming 650091YunnanChina

Printable mesoscopic perovskite solar cells(PM-PSCs)possess notable merits in terms of cost-effectiveness,easy manufacturing,and large scale ***,the absence of a hole transport layer contributes to the exacerbation of carrier recombination,and the defects between the perovskite and electron transport layer(ETL)interfaces significantly decrease the efficiency of the *** this study,a bifunctional surface passivation approach is proposed by applying a thioacetamide(TAA)surfactant on the mesoporous TiO_(2)*** results demonstrate that TAA molecules could interact with TiO_(2),thereby diminishing the oxygen vacancy ***,the amino group and sulfur atoms in TAA molecules act as Lewis base to effectively passivate the uncoordinated Pb^(2+)in perovskite and improve the morphology of perovskite,and decrease the trap-state density of *** TAA passivation mechanism improves the alignment of energy levels between TiO_(2)and perovskite,facilitating electron transport and reducing carrier ***,the TAA-passivated device achieved a champion power conversion efficiency(PCE)of 17.86%with a high fill factor(FF)of 79.16%and an open-circuit voltage(V_(OC))of 0.971 *** investigation presents a feasible strategy for interfacial passivation of the ETL to further improve the efficiency of PM-PSCs.

关键词： Perovskite solarcells Carbon electrode Thioacetamide Interfacial passivation

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Facile surface regulation for highly efficient and thermally stable perovskite solar cells via chlormequat chloride

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Chinese Chemical Letters 2024年第10期35卷 543-549页

作者： Bo Yang Pu-An Lin Tingwei Zhou Xiaojia Zheng Bing Cai wen-hua zhang Institute of Chemical Materials China Academy of Engineering Physics School of Physical Science and Technology Southwest University Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies School of Materials and EnergyYunnan University

Defects at the surface and grain boundaries of the perovskite films are extremely detrimental to both the efficiency and stability of perovskite solar cells （PSCs）.Herein,a simple and stable quaternary ammonium halide,named chlormequat chloride （i.e.,chlorinated choline chloride,CCC）,is introduced to regulate the upper surface chemical environment of perovskite *** anion （Cl-） and cation[ClCH2CH2N（CH3）3]+in CCC could effectively self-search and passivate positively and negatively charged ionic defects in per ovskites,respectively,which contributes to inhibited nonradiative recombination and reduced energy los in *** a result,the champion power conversion efficiency （PCE） of PSCs can be significantly enhanced from 22.82%to 24.07%.Moreover,the unencapsulated device with CCC modification retains 92.0%of it original PCE even subject to thermal aging at 85°C for 2496 *** work provides guidance for the ratio nal design of functional molecules as defect passivators in PSCs,which is beneficial for the improvement in both device performance and stability.

关键词： Chlormequat chloride Perovskite solar cells Quaternary ammonium halide Surface modulation Thermal stability

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Organolead halide perovskite：A rising player in high-efficiency solar cells

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催化学报 2014年第7期35卷 983-988页

作者： Zhou Yang wen-hua zhang Dalian Institute of Chemical Physics Chinese Academy of Sciences

这个观点介绍对 organolead 卤化物的简短描述基于 perovskite 的太阳能电池包括结构和 perovskite 的基本性质，太阳能电池的分类，和他们是的潜力的眼界双人脚踏车的 subcells 光电的设备和大规模适用性。

关键词：太阳能电池钙钛矿卤化物有机铅 TiO2薄膜球员功率转换效率太阳光

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A novel pairing-free certificateless authenticated key agreement protocol with provable security

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Frontiers of Computer Science 2013年第4期7卷 544-557页

作者： Haiyan SUN Qiaoyan wen hua zhang Zhengping JIN State Key Laboratory of Networking and Switching Technology Beijing University of Posts and Telecommunications Beijing 100876 China

Recently, He et al. （Computers and Mathematics with Applications, 2012） proposed an efficient pairing-free certificateless authenticated key agreement （CL-AKA） protocol and claimed their protocol was provably secure in the extended Canetti-Krawczyk （eCK） model. By giving concrete attacks, we indicate that their protocol is not secure in the eCK model. We propose an improved protocol and show our improvement is secure in the eCK model under the gap DiffieHellman （GDH） assumption. Furthermore, the proposed protocol is very efficient.

关键词： attacks pairings eCK model provable security,certificateless authenticated key agreement

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Cryptanalysis and improvement of a certificateless encryption scheme in the standard model

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Frontiers of Computer Science 2014年第1期8卷 163-173页

作者： Lin CHENG Qiaoyan wen Zhengping JIN hua zhang State Key Laboratory of Networking and Switch Technology Beijing University of Posts and Telecommunications Beijing 100876 China

Certificateless public key cryptography elimi- nates inherent key escrow problem in identity-based cryptog- raphy, and does not yet requires certificates as in the tradi- tional public key infrastructure. In this paper, we give crypt- analysis to Hwang et al.＇s certificateless encryption scheme which is the first concrete certificateless encryption scheme that can be proved to be secure against ＂malicious-but- passive＂ key generation center （KGC） attack in the stan- dard model. Their scheme is proved to be insecure even in a weaker security model called ＂honest-but-curious＂ KGC at- tack model. We then propose an improved scheme which is really secure against ＂malicious-but-passive＂ KGC attack in the standard model.

关键词： certificateless public key cryptography stan-dard model provable security

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Organolead halide perovskites:a family of promising semiconductor materials for solar cells

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Chinese Science Bulletin 2014年第18期59卷 2092-2101页

作者： wen-hua zhang Bing Cai State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian National Laboratory for Clean Energy Carbon Research Laboratory Liaoning Key Laboratory for Energy Materials and Chemical EngineeringState Key Laboratory of Fine ChemicalsDalian University of Technology

Great attention has recently been drawn to developing cost-effective,high efficiency solar cells to meet the ever increasing demand for clean *** have most recently witnessed a breakthrough and a rapid development in solid state,hybrid solar cells using organolead halide perovskites as light *** semiconductors can not only serve as sensitizer in solid state sensitized solar cells with efficiency up to unprecedented 15%,but also function as both light absorber and hole conductor(or electron conductor)at the same time to display power conversion efficiency above 10%.In this review,we will introduce their operation mechanism,structure,and especially the development of the organolead halide perovskite based solar *** on the achievements that have been made to date,solid state photovoltaic device with superior performance than the present one is highly expected.

关键词：太阳能电池半导体材料钙钛矿卤化物有机铅家庭功率转换效率光电转换装置

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Nanocrystals of halide perovskite:Synthesis,properties,and applications

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Journal of Energy Chemistry 2018年第3期27卷 622-636页

作者： Chi Yang Yihui Wu Qingshan Ma wen-hua zhang Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering PhysicsChengdu 610200Sichaan.China National Energy Novel Materials Center 596 Yinhe Road.Shuangliu.Chengdu 610200Sichuan.China

Recently, halide perovskite materials have become an exciting topic of research mainly due to their outstanding photovoltaic performance with the highest efficiency up to 22.1% at present. The nanocrystals（NCs） of these perovskites show quantum size effect, tunable bandgap, and excellent photoluminescence quantum yield（PLQY） in specific cases. Perovskite NCs have hence displayed great potentials in a broad range of applications, such as solar cells, light-emitting devices（LEDs）, photodetectors, and lasers. In this review, we summarized the recent progress on the synthesis, optoelectronic properties and applications of the nanostructures of these halide perovskite materials, including hybrid organic–inorganic perovskites,pure inorganic perovskite, and perovskite-derived NCs. We have also provided a critical outlook into the challenges ahead.

关键词： Perovskite Nanocrystals Photoluminescence Optoelectronic devices

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Involvement of Hydrogen Peroxide Generated by Polyamine Oxidative Degradation in the Development of Lateral Roots in Soybean

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Journal of Integrative Plant Biology 2006年第4期48卷 426-432页

作者： Guo-Xing Su wen-hua zhang You-Liang Liu College of Life Sciences Nanjing Agricultural University Soybean Research Institute Nanjing Agricultural University National Center of Soybean Improvement Ministry of Agriculture Nanjing 210095 China College of Life Sciences Suzhou University Suzhou 215006 China

In order to determine whether hydrogen peroxide （H2O2） generated by polyamlne oxidative degradation Is Involved In the development of lateral roots In soybean, the length and the number of lateral roots, the actlvltlea of polyamlne oxldases and dlamlne oxldases, and the endogenous free polyamlne and H2O2 content were analyzed In soybean （Giycine max （Linn.） Merr.） main roots of 2-d-old seedlings after treatments for 2 d with exogenous β-hydroxyethylhydrazine （an Inhibitor of polyamlne oxldases）, H202, putresclne, cyclohexylamlne （an Inhibitor of spermidine synthase） or N,N＇-dimethylthlourea （a scavenger of hydrogen peroxide）.β-hydroxyethylhydrazlne treatment strongly Inhibited the development of lateral roots In soybean seedlings, reduced the activities of polyamine oxldases and dlamlne oxidases, decreased H2O2 levels, and led to the accumulation of endogenous polyamlnes In the main roots. The inhibitory effect of β-hydroxyethylhydrazlne on root development could be alleviated by exogenously applied 10 μmol/L H2O2 （a major product of polyamlne oxidation）. Treatment with cyclohexylamlne and putresclne promoted root growth slightly, but treatment with cyclohexylamlne plus N,N＇dlmethylthlourea or putresclne plus N,N＇-dlmethylthlourea prevented the development of soybean lateral roots. The effects of these treatments on the development of soybean lateral roots were consistent with the changes In endogenous H2O2 levels. These results suggest that the development of soybean lateral roots Is associated with the oxidative degradation of polyamlnes, and that their products, especially H2O2, are likely to play an Important role In the growth of soybean lateral roots.

关键词： β-hydroxyethylhydrazine hydrogen peroxide polyamine oxidases polyamines soybean lateral roots.

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Defect passivation through electrostatic interaction for high performance flexible perovskite solar cells

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Journal of Energy Chemistry 2020年第7期29卷 173-177,I0006页

作者： Deyu Xin Shujie Tie Xiaojia Zheng Jianguo Zhu wen-hua zhang Department of Materials Science Sichuan UniversityChengdu 610064SichuanChina Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering PhysicsChengdu 610200SichuanChina

The light weight,good bending resistance and low production cost make flexible perovskite solar cells(PSCs)good candidates in wearable electronics,portable charger,remote power,and flying *** power conversion efficiency(PCE)plays a crucial role on obtaining the high mass specific power of flexible ***,the performance for flexible PSCs is still having a large room to be ***,we added the 2-amino-5-cyanopyridine(ACP)molecule with a polar electron density distribution in the perovskite precursor solution to improve the performance of flexible *** cyano groups with electron-withdrawing ability are expected to passivate positively charged point defects,while amines with electron donating ability are expected to passivate negatively charged point defects in perovskite *** to the effective passivation of defects at the grain boundary and surface of perovskite films,the PCE of flexible PSCs is obviously increased from 16.9%to 18.0%.These results provide a universal approach to improve performance of flexible PSCs by healing the defects in perovskite films through electrostatic interactions.

关键词： Perovskite solar cell Flexible Electrostatic interaction Defect passivation Recombination

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Toward high-efficiency perovskite solar cells with one-dimensional oriented nanostructured electron transport materials

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Journal of Energy Chemistry 2023年第7期82卷 66-87,I0003页

作者： Yinhua Lv Bing Cai Ruihan Yuan Yihui Wu Quinn Qiao wen-hua zhang Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies School of Materials and EnergyYunnan UniversityKunming 650500YunnanChina School of Chemical Engineering Sichuan UniversityChengdu 610065SichuanChina Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering PhysicsChengdu 610200SichuanChina Mechanical and Aerospace Engineering Syracuse UniversitySyracuseNew York 13244USA Yunnan University and Southwest United Graduate School Kunming 650500YunnanChina

The unique advantages of one-dimensional(1D)oriented nanostructures in light-trapping and chargetransport make them competitive candidates in photovoltaic(PV)*** the emergence of perovskite solar cells(PSCs),1D nanostructured electron transport materials(ETMs)have drawn tremendous ***,the power conversion efficiencies(PCEs)of these devices have always significantly lagged behind their mesoscopic and planar ***-efficiency PSCs with 1D ETMs showing efficiency over 22%were just realized in the most recent *** yet lacks a comprehensive review covering the development of 1D ETMs and their application in *** hence timely summarize the advances in 1D ETMs-based solar cells,emphasizing on the fundamental and optimization issues of charge separation and collection ability,and their influence on PV *** sketching the classification and requirements for high-efficiency 1D nanostructured solar cells,we highlight the applicability of 1D TiO_(2)nanostructures in PSCs,including nanotubes,nanorods,nanocones,and nanopyramids,and carefully analyze how the electrostatic field affects cell *** kinds of oriented nanostructures,e.g.,ZnO and SnO_(2)ETMs,are also ***,we discuss the challenges and propose some potential strategies to further boost device *** review provides a broad range of valuable work in this fast-developing field,which we hope will stimulate research enthusiasm to push PSCs to an unprecedented level.

关键词： 1D nanostructures Perovskite solar cells Electron transport materials Electrostatic field High-efficiency

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