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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

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

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

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

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.

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

A facile solution processed ZnO@ZnS core–shell nanorods arrays for high-efficiency perovskite solar cells with boosted stability

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Journal of Energy Chemistry 2021年第10期30卷 553-560,I0014页

作者： Kun Chen Weijian Tang Yu Chen Ruihan Yuan Yinhua Lv wenjuan Shan wen-hua zhang Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering Physics596 Yinhe RoadChengdu 610200SichuanChina Tongwei Solar(Chengdu)Co. LTD888 Linjiaci RoadChengdu 610200SichuanChina Institute of Chemistry for Functionalized Materials College of Chemistry and Chemical EngineeringLiaoning Normal UniversityDalian 116029LiaoningChina

Zinc Oxide(ZnO)has been extensively applied as electron transport material(ETM)in perovskite solar cells(PSCs)since the emergence of ***,some chemisorbed oxygen species on the surface of ZnO can cause the degradation of CH3NH3+(MA^(+))based *** avoid the destructive effect of ZnO,a facile solution strategy was proposed to produce a ZnS shell around the ZnO nanorods arrays(ZnO-NRs),***@ZnS core-shell nanorods(ZnO-NRs@ZnS).The ZnO-NRs@ZnS cascade structure can not only facilitate carrier transport,but also enhance the stability of ZnO based PSCs.A power conversion efficiency(PCE)of 20.6%was finally yielded,which is the-state-of-the-art efficiency for PSCs with one-dimensional(1 D)ZnO electron transport materials(ETMs).Moreover,over 90%of the initial efficiency was retained for the unencapsulated device with ZnO-NRs@ZnS ETMs at 85℃for 500 h,demonstrating excellent *** work provides a simple and efficient avenue to simultaneously enhance the photovoltaic(PV)performance and stability of 1 D ZnO nanostructure-based PSCs.

关键词： Zinc Oxide nanorods arrays Core-cell structure Electron transport material Perovskite solar cells Stability

Incubation and development of corrosion in microstructures of low alloy steels under a thin liquid film of NaCl aqueous solution

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International Journal of Minerals,Metallurgy and Materials 2010年第6期17卷 748-755页

作者： wen-hua zhang Shan-wu Yang Jia Guo Zhi-yong Liu Xin-lai He School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

Electrochemical measurement, optical microscopy, and scanning electron microscopy were employed to investigate the corrosion behavior of some low alloy steels. The steels were held under a thin liquid film of 0.5wt% NaCl aqueous solution. It is found that the steels with the same chemical composition but different micmstructures exhibit obviously different corrosion behaviors. However, the corrosion behavior of the steels with different compositions but the same microstructnres may be similar in the present investigation. The corrosion rate of bainite is slower than that of ferrite and pearlite. The corrosion products of bainite are uniform and fine. The size of carbon-rich phases produces a great impact on the corrosion of the steels, whether in the initial stage or in the long tenn. It is easy to induce large pitting for carbon-rich phases with large size, which damages the compactness of the rust layer.

关键词： alloy steel microstructure atmospheric corrosion liquid films scanning electron microscope

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 517-523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 PhysicsMianyang 621900China School of Physical Science and Technology Southwest UniversityChongqing 400715China Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies School of Materials and EnergyYunnan UniversityKunming 650000China

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[ClCH_(2)CH_(2)N(CH_(3))_(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℃ 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： Perovskite solarcells Quaternary ammonium halide Chlormequat chloride Surface modulation Thermal stability