Preventing inhomogeneous elemental distribution and phase segregation in mixed Pb-Sn inorganic perovskites via incorporating PbS quantum dots  

作　　者：Tao Zhang Huaxia Ban Qiang Sun Han Pan Haixuan Yu Zhiguo Zhang Xiaoli Zhang Yan Shen Mingkui Wang 

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China [2]State Centre for International Cooperation on Designer Low-Carbon&Environmental Materials,School of Materials Science and Engineering,Zhengzhou University,Zhengzhou 450001,Henan,China

出　　处：《Journal of Energy Chemistry》2022年第2期179-185,共7页能源化学（英文版）

基　　金：Financial support from the National Key Research and Development Program of China (2019YFE0101300, 2018YFB1502900);the National Natural Science Foundation of China (No. 21975088);the National Natural Science Foundation of China Major International (Regional) Joint Research Project (No. 51961165106);the double first-class research funding of China-EU Institute for Clean and Renewable Energy (3011187029)。

摘　　要：Inhomogeneous Pb/Sn elemental distribution and the resulted phase segregation in mixed Pb-Sn halide perovskites would result in energy disorder(band structure and phase distribution disorder),which greatly limits their photovoltaic performance.Here,Pb S quantum dot has been synthesized and demonstrated as seeds for modulation crystallization dynamics of the mixed Pb-Sn inorganic perovskites,allowing an enhanced film quality and significantly suppressing phase segregation.With this additive power conversion efficiency of 8%and 6%is obtained under irradiation of full sunlight in planar and mesoporous structured solar cells in combination with CsPb_(0.5) Sn_(0.5)I_(2)Br inorganic perovskite,respectively.Our finding reveals exploring the actual Pb/Sn atoms location in perovskite structure and its influence on developing efficient and stable low-bandgap perovskite solar cells.

关 键 词：Inorganic perovskite Phase segregation Optoelectronic material Photovoltaic device 

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]