The integration structure enhances performance of perovskite solar cells  

采用集成结构提高钙钛矿太阳电池性能

作　　者：Qiang Zeng Xianyi Meng Zhimin Fang Ming Cheng Shangfeng Yang Yongbo Yuan Yuanhang Cheng Zhiwen Jin Qinye Bao Fangyang Liu Feng Hao Liming Ding 曾强;孟宪义;方志敏;程明;杨上峰;袁永波;程远航;靳志文;保秦烨;刘芳洋;郝峰;丁黎明(Center for Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China;School of Metallurgy and Environment,Central South University,Changsha 410083,China;University of Chinese Academy of Sciences,Beijing 100049,China;Institute for Energy Research,Jiangsu University,Zhenjiang 212013,China;Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China;School of Physics and Electronics,Central South University,Changsha 410083,China;Solar Energy Research Institute of Singapore,National University of Singapore,Singapore 117574,Singapore;School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,China;Key Laboratory of Polar Materials and Devices,Department of Electronic Science,School of Physics and Electronic Science,East China Normal University,Shanghai 200241.China;School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,China)

机构地区：[1]Center for Excellence in Nanoscience(CAS),Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS),National Center for Nanoscience and Technology,Beijing 100190,China [2]School of Metallurgy and Environment,Central South University,Changsha 410083,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]Institute for Energy Research,Jiangsu University,Zhenjiang 212013,China [5]Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China [6]School of Physics and Electronics,Central South University,Changsha 410083,China [7]Solar Energy Research Institute of Singapore,National University of Singapore,Singapore 117574,Singapore [8]School of Physical Science and Technology,Lanzhou University,Lanzhou 730000,China [9]Key Laboratory of Polar Materials and Devices,Department of Electronic Science,School of Physics and Electronic Science,East China Normal University,Shanghai 200241.China [10]School of Materials and Energy,University of Electronic Science and Technology of China,Chengdu 611731,China

出　　处：《Science Bulletin》2021年第4期310-313,M0003,共5页科学通报（英文版）

基　　金：the National Key Research and Development Program of China(2017YFA0206600);the National Natural Science Foundation of China(51773045,21772030,51922032 and 21961160720)。

摘　　要：In recent years,all-inorganic perovskite solar cells(PSCs)have attracted tremendous interest due to their excellent thermal stability[1-3].Unlike organic-inorganic halide perovskites,whose organic component is volatile at temperatures higher than 2000C,all-inorganic perovskites can tolerate temperatures over 400℃without deterioration[4].However,the power conversion efficiency(PCE)for all-inorganic PSCs is much lower than that of organic-inorganic halide PSCs mainly due to its wider bandgap,which leads to limited light absorption and low short-circuit current density(Jsc).At present,the most studied all-inorganic perovskites are CsPbI3 and CsPbI2Br.Partly replacing I with Br can decrease the preparation temperature,but the bandgap will increase[5,6].To improve the performance of inorganic PSCs,many researches focused on crystallinity control and interfacial engineering[7-10].Few works were done to broaden the photoresponse to improve Jsc,thus improving the PCE.Developing tandem or integrated solar cells is an effective approach to make full use of sunlight[11,12].For tandem solar cells,the preparation process is very complicated.近几年,全无机钙钛矿太阳电池因其优异的热稳定性而受到广泛关注.尽管全无机钙钛矿材料可以耐受400℃以上的高温,热稳足性远远优于有机无机杂化钙钛矿材料,但其较大的禁带宽度限制了全无机钙钛矿太阳电池对光谱的利用范围,进而限制了太阳电池的效率.将有机体异质结与钙钛矿集成构筑集成太阳电池可以有效拓宽太阳电池的光谱响应范围.基于此概念,本文采用一种有机聚合物给体材料PTB7-Th,集成太阳电池结构获得了高性能的全无机钙钛矿CsPbI2Br太阳电池.结果表明,PTB7-Th可将CsPbI2Br太阳电池的光谱响应范围拓宽至770 nm;进一步对PTB7-Th掺杂锂盐提高空穴迁移率后,CsPbI2Br太阳电池在680~770 nm处的光电响应有显著提升.最终,CsPbI2Br太阳电池获得了14.63%的光电转换效率.

关 键 词：钙钛矿太阳电池 光电转换效率 有机无机杂化钙钛矿 光谱响应范围 给体材料 有机聚合物 空穴迁移率 集成结构 

分 类 号：TB34[一般工业技术—材料科学与工程] TM914.4[电气工程—电力电子与电力传动]