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Direct drop-casting synthesis of all-inorganic lead and lead-free halide perovskite microcrystals for high-performance photodetectors

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Nano Research 2022年第4期15卷 3621-3627页

作者： Zhengxun Lai You Meng Fei Wang Xiuming Bu Wei Wang pengshan xie Weijun Wang Chuntai Liu SenPo Yip Johnny C.Ho Department of Materials Science and Engineering City University of Hong KongKowloonHong Kong 999077China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130021China State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong 999077China Key Laboratory of Advanced Materials Processing&Mold(Zhengzhou University) Ministry of EducationZhengzhou 450002China Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka 816–8580Japan

Due to the exciting photoelectric properties,better stability,and environmental-friendly nature,all-inorganic halide perovskites(AIHPs),especially the lead-free perovskites,have attracted worldwide ***,the film quality of AIHPs fabricated by typical spin-coating and subsequent high-temperature annealing is still not satisfactory,restricting their further ***,we demonstrate a simple low-temperature solution-processed drop-casting method to achieve highly-crystalline cubic CsPbBr_(3)and lead-free layer-structured Cs_(3)Sb_(2)I_(9)microcrystals(MCs).This drop-casting technique not only consumes the less amount of precursor solution but also eliminates the high-temperature annealing as compared with those of spin *** these MCs are configured into photodetectors,they exhibit superior device performance,which is in distinct contrast to the one of spin-coated ***,the responsivity of CsPbBr_(3)MCs is found to be as large as 8,990 mA/W,being 13 times larger than the spin-coated films and even better than many state-of-the-art solution-processed AIHPs *** device performance enhancement is attributed to the better film quality and phase purity obtained by the drop-casting *** these results can evidently fill the“technology gap”for further enhancing the material quality of solution-processed AIHPs and breaking down the barriers that hinder the development of AIHPs based optoelectronic devices.

关键词： halide perovskite drop-casting photodetector CsPbBr_(3) Cs_(3)Sb_(2)I_(9)

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Hybrid C8-BTBT/In GaAs nanowire heterojunction for artificial photosynaptic transistors

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Journal of Semiconductors 2022年第11期43卷 9-21页

作者： Yiling Nie pengshan xie Xu Chen Chenxing Jin Wanrong Liu Xiaofang Shi Yunchao Xu Yongyi Peng Johnny C.Ho Jia Sun Junliang Yang Hunan Key Laboratory for Super Microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong Kong SARChina State Key Laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloon 999077Hong Kong SARChina Key Laboratory of Advanced Materials Processing&Mold(Zhengzhou University) Ministry of EducationZhengzhou 450002China

The emergence of light-tunable synaptic transistors provides opportunities to break through the von Neumann bottleneck and enable neuromorphic ***,a multifunctional synaptic transistor is constructed by using 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene(C8-BTBT)and indium gallium arsenide(InGaAs)nanowires(NWs)hybrid heterojunction thin film as the active *** illumination,the Type-I C8-BTBT/InGaAs NWs heterojunction would make the dissociated photogenerated excitons more difficult to *** persistent photoconductivity caused by charge trapping can then be used to mimic photosynaptic behaviors,including excitatory postsynaptic current,long/short-term memory and Pavlovian ***,a high classification accuracy of 89.72%can be achieved through the single-layer-perceptron hardware-based neural network built from C8-BTBT/InGaAs NWs synaptic ***,this work could provide new insights into the fabrication of high-performance optoelectronic synaptic devices.

关键词： photonic synaptic transistor C8-BTBT InGaAs heterojunction

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High-performance photodetectors based on two-dimensional perovskite crystals with alternating interlayer cations

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Journal of Materiomics 2023年第4期9卷 817-823页

作者： Yezhan Li Zhengxun Lai You Meng Wei Wang Yuxuan Zhang Xuwen Zhao Di Yin Weijun Wang pengshan xie Quan Quan SenPo Yip Johnny C.Ho Department of Materials Science and Engineering City University of Hong Kong999077Hong Kong SARChina Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka816-8580Japan State Key Laboratory of Terahertz and Millimeter Waves City University of Hong Kong999077Hong Kong SARChina

Organic-inorganic halide perovskite,as a low-cost,solution-processable material with remarkable optoelectronic properties,is ideal candidate to fabricate high-performance photodetectors and is expected to significantly reduce device *** to the common Dion-Jacobson and Ruddlesden-Popper two-dimensional(2D)layered hybrid perovskite compounds,the perovskites with alternating cations in the interlayer(ACI)phase show higher crystal symmetry and narrower optical bandgaps,which exhibit great potential for excellent photodetection ***,we report a high-performance photodetector based on the 2D bilayered hybrid lead halide perovskite single crystal with the ACI phase(GAMA_(2)Pb_(2)I_(7);GA=C(NH_(2))_(3)and MA=CH_(3)NH_(3)).The single-crystal photodetector exhibits high photoresponsivity of 1.56,2.54,and 2.60 A/W for incident light wavelengths of 405,532,and 635 nm under 9.82 nW,respectively,together with the correspondingly high detectivity values of 1.86×10^(12),3.04×10^(12),and 3.11×10^(12)Jones under the same operating ***,a high-resolution imaging sensor is built based on the GAMA_(2)Pb_(2)I_(7)single-crystal photodetector,confirming the high stability and photosensitivity of the imaging *** results show that the 2D hybrid lead halide perovskites with alternating interlayer cations are promising for high-performance visible light photodetectors and imaging systems.

关键词： Photodetector Two-dimensional Hybrid perovskite Alternating interlayer cation Imaging

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The effect of air exposure on device performance of flexible C8-BTBT organic thin-film transistors with hygroscopic insulators

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Science China Materials 2020年第12期63卷 2551-2559页

作者： pengshan xie Tianjiao Liu Pei He Guozhang Dai Jie Jiang Jia Sun Junliang Yang Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China

Organic thin film transistors(OTFTs)are normally sensitive to ambient conditions and show performance degradation in *** the contrary,the performance of flexible 2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene(C8-BTBT)OTFTs using cross-linked polymer layer,poly(4-vinyl-phenol)-4,4’-(hexafluoroisopropylidene)diphthalic anhydride(PVP-HDA),as the dielectric layer can be improved in air conditions with 40%relative *** soaking in air with 40%relative humidity,the electrical behavior,surface morphology,and contact angle of the flexible C8-BTBT OTFTs using PVP-HAD as dielectric layer with three different thicknesses were *** is found that,when the devices with 375 nm-thick PVP-HDA films are placed in 40%relative humidity air conditions for 6 h,the corrected average mobility(μ)can increase from 3.2 to 5.1 cm^2 V^-1 s^-***,the average threshold voltage(Vth)changes from-12.4 to-9.3 V while keeping a constant ratio of I on/Ioff=10^*** results indicate that the flexible C8-BTBT OTFTs with PVP-HDA dielectric layer exhibit interesting application prospects.

关键词： flexible electronics C8-BTBT OTFTs PVP-HDA hygroscopicity air stability

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Solution-processed ultra-flexible C8-BTBT organic thin-film transistors with the corrected mobility over 18 cm^2/(V s)

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Science Bulletin 2020年第10期65卷 791-795,M0003页

作者： pengshan xie Tianjiao Liu Jia Sun Jie Jiang Yongbo Yuan Yongli Gao Jianfei Zhou Junliang Yang State Key Laboratory of Powder Metallurgy School of Physics and ElectronicsCentral South UniversityChangsha 410083China Department of Physics and Astronomy University of RochesterNew YorkNY 14627USA Lucky Huaguang Graphics Co. LtdNanyang 473003China

Organic thin film transistors(OTFTs)show great potential for applications in low-cost,light-weight flexible *** were first reported in 1986 with polythiophene as the active layer material with a mobility of^105 cm2/(V s)[1].Since then,OTFTs have shown impressive improvements in device performance parameters,e.g.,mobility improved by over 4 orders of *** advances followed discoveries of new materials and improvements in device engineering,as well as in morphology and interface engineering[2–4].Flexible OTFTs(f-OTFTs)as a very important electronic component in flexible electronics are attracting a great deal of attention from both academic and industrial ***,f-OTFTs are potentially used for electronic skin[5],flexible organic integrated circuits[6],flexible active matrix displays[7]and neuromorphic devices[8].

关键词：有机薄膜晶体管高迁移率栅电极溶液法校正因子弯曲半径活性层沉积金属

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A study on the tourism practitioners' perception of tourism impact:a case study of Hainan,China

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Ecological Economy 2009年第2期5卷 168-176页

作者： xie Genzong Chen Yongsheng Qiu Penghua Li pengshan College of Geography and Tourism Hainan Normal University Haikou 571158 P R China

This study examines the urban population of tourism practitioners' perceptions of economic, environmental, and social impacts on cultural, convention, and sport tourism may have in Haikou and Sanya, Hainan, China. The study uses a modif ied Urban Tourism Impact (UTI) to examine economic, environmental, and social perceived impacts. Analysis of the data includes testing three models of structural relationships between tourism impacts and support for development in each of the tourism market sub-divisions through a confirmatory factor analysis. The results of this study show that the positive economic impacts consistently exert influence on predicting support for tourism development in all three models. However, the social impacts play a greater explanatory role with all three market segment, the negative environmental impacts play a role in determining support for sport tourism only. Differences have been found with those with a higher education level in predicting support for cultural tourism, but not convention or sport tourism.

关键词： Community, perceptions Tourism impact, Urban tourism impact

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GIS- and RS-based Analysis of Suburban Landscape Layout in Haikou City

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Journal of Landscape Research 2013年第4期5卷 1-4,8页

作者： xie Genzong LI pengshan SU Shan MENG Xiangcai LI Min College of Geography and Tourism Hainan Normal University Department of Tourism Hainan Technology and Business College

Landsat TM/ETM+ and Alos remote sensing data of the study area in 1991, 2001 and 2010 were interpreted by using object-oriented RS image extraction technology, landscape ecology theories were applied as well as GIS and FRAGSTATS4.1 to choose reasonable landscape indexes for studying temporal-spatial changes of suburban landscape layouts of Haikou City, exploring spatial features and change tendency of rural landscapes. According to the results, tropical garden landscapes have taken a dominant status in the last 2 decades; tropical farmland landscapes have had the most complicate shapes; tropical open forest landscapes have been most influenced by human interventions but had the best connectivity and high degree of concentration; tropical settlement landscapes and tropical meadow landscapes have been widely scattered with poor connectivity; landscape connectivity has been well maintained; contagion index has changed slightly, landscape equilibrium has been stable; landscape diversity has been maintained, all landscape types have been evenly distributed, landscape fragmentation has increased, and landscape heterogeneity has grown.

关键词： Suburbs of Haikou City Rural landscapes Spatial distribution Landscape layout

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Semi-Discrete and Fully Discrete Weak Galerkin Finite Element Methods for a Quasistatic Maxwell Viscoelastic Model

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Numerical Mathematics(Theory,Methods and Applications) 2023年第1期16卷 79-110页

作者： Jihong Xiao Zimo Zhu Xiaoping xie School of Mathematics Sichuan UniversityChengdu 610064China Mathematics Department of Jinjiang College Sichuan UniversityPengshan 620860China

This paper considers weak Galerkin finite element approximations on polygonal/polyhedral meshes for a quasistatic Maxwell viscoelastic *** spatial discretization uses piecewise polynomials of degree k(k≥1)for the stress approximation,degree k+1 for the velocity approximation,and degree k for the numerical trace of velocity on the inter-element *** temporal discretization in the fully discrete method adopts a backward Euler difference *** show the existence and uniqueness of the semi-discrete and fully discrete solutions,and derive optimal a priori error *** examples are provided to support the theoretical analysis.

关键词： Quasistatic Maxwell viscoelastic model weak Galerkin method semi-discrete scheme fully discrete scheme error estimate

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生活在别处:谢灵运──中古风流之六

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寻根 2001年第6期 11-15页

作者：鲍鹏山

如果说陶渊明是田园诗的开山，那么谢灵运则是山水诗的鼻祖了。他是“元康之英”过后，试图从体制中解脱自己的又一个人物。文学史家们喜欢强调陶渊明与谢灵运的不同，是的，他们的为人风格与为文风格都有极大的不同。由于陶渊明的杰... 详细信息

如果说陶渊明是田园诗的开山，那么谢灵运则是山水诗的鼻祖了。他是“元康之英”过后，试图从体制中解脱自己的又一个人物。文学史家们喜欢强调陶渊明与谢灵运的不同，是的，他们的为人风格与为文风格都有极大的不同。由于陶渊明的杰出成就与崇高地位，把谢灵运与他放在一起比（共5页)

关键词：谢灵运陶渊明为文山水诗田园诗叶嘉莹人物文学史家教授中古

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东寨港红树林国家级自然保护区海水水质状况分析与评价

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海洋湖沼通报 2010年第4期 53-60页

作者：李鹏山谢跟踪李巧香陈小红周青青海南工商职业学院旅游系海南海口570203 海南师范大学海南海口571158 海南省海洋监测中心海南海口361005 海南省海洋地质调查研究院海南海口570206

根据2004~2008年东寨港红树林国家级自然保护区的水质监测结果,采用水质单因子质量指数评价法、有机污染指数法和富营养化水平法对东寨港红树林国家级自然保护区水质污染状况进行分析评价,并采用秩相关系数法对该海域近5a水质状况进行... 详细信息

根据2004~2008年东寨港红树林国家级自然保护区的水质监测结果,采用水质单因子质量指数评价法、有机污染指数法和富营养化水平法对东寨港红树林国家级自然保护区水质污染状况进行分析评价,并采用秩相关系数法对该海域近5a水质状况进行趋势分析。结果表明：东寨港红树林国家级自然保护区海域无机氮和活性磷酸盐有超标现象;该海域2005年和2008年有机污染指数值较高,受到较严重污染或轻度污染;该海域近5a中仅2006年水体处于贫营养化水平,其余各年营养水平处于富营养化程度或高富营养化程度;趋势分析显示该海域水质呈逐年下降趋势,但不显著。因此,对富含N、P等造成该海域富营养化的污染物的治理是该海域环境管理和污染治理的重点。

关键词：东寨港海水水质状况趋势

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