Diffusion-correlated local photoluminescence kinetics in CH_3NH_3PbI_3 perovskite single-crystalline particles  

CH_3NH_3PbI_3钙钛矿单晶中扩散相关的局域光致发光动力学(英文)

作　　者：赵春一 田文明 冷静 崔荣荣 刘维峰 金盛烨 

机构地区：[1]School of Physics and Optoelectronic Engineering, Dalian University of Technology [2]State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences

出　　处：《Science Bulletin》2016年第9期665-669,共5页科学通报（英文版）

基　　金：supported by the State Key Laboratory of Molecular Reaction Dynamics at Dalian Institute of Chemical Physics of Chinese Academy of Sciences;the National Natural Science Foundation of China(21473192);the National Basic Research Program of China(2013CB834604)

摘　　要：Understanding the correlation between the life- time, mobility and diffusion length of photoinduced charge carriers in organolead halide perovskite is essential to suc- cessful perovskite-based solar cells. In this paper, through mapping the local photoluminescence （PL） dynamics using laser/PL-scanned confocal imaging microscopy and simu- lating the carrier diffusion process in an individual CH3NH3PbI3 single-crystalline particle, we report that the rapid diffusion of charge carriers can produce a fast local PL kinetics when the perovskite is partially excited. This result indicates that using PL kinetics to estimate the carrier life- time in perovskite single crystals needs to exclude the effect of carrier diffusion.有机铅卤化物钙钛矿半导体材料由于其在构建高效、廉价太阳能电池和其他光电器件等方面展现出极大的应用价值,成为国际上尤为重要的研究热点材料之一.此类材料在太阳能电池和各种器件中的优越表现得益于其独特的光物理性质,如高吸光系数、长载流子寿命、高电荷迁移率和长迁移距离等.然而,了解钙钛矿材料中光生载流子寿命、迁移率和扩散距离之间的关系对于高效太阳能电池的制备非常关键.本文通过使用激光/荧光扫描共聚焦显微镜测量局域发光动力学和模拟单个CH_3NH_3PbI_3单晶中的载流子扩散过程,发现当钙钛矿材料在没有均匀激发情况下,快速的载流子扩散过程会加快局域光致发光动力学过程.结果表明,在钙钛矿单晶中根据光致发光动力学过程来解析载流子寿命时,必须排除载流子扩散的影响.

关 键 词：Organolead halide perovskites Carrierdiffusion Photoluminescence kinetics 

分 类 号：O621.22[理学—有机化学] TM914.4[理学—化学]