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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.
Organic lead-perovskite perovskite semiconductors have become one of the most important research hotspots in the world due to their great application value in building efficient, cheap solar cells and other optoelectronic devices, etc. Such materials are widely used in solar cells And superior performance in a wide range of devices thanks to its unique photophysical properties such as high extinction coefficient, long carrier lifetime, high charge mobility and long migration distance, etc. However, understanding the photo-current-carrying in perovskite materials The relationship between sub-lifetime, mobility and diffusion distance is crucial for the preparation of high efficiency solar cells.In this paper, local luminescence kinetics and the simulation of carrier diffusion in a single CH_3NH_3PbI_3 single crystal were measured by using a laser / fluorescence scanning confocal microscope , It was found that the rapid charge carrier diffusion process will accelerate the local photoluminescence kinetics when the perovskite material is not uniformly excited.The results show that in the perovskite single crystal according to the photoluminescence kinetics When analyzing carrier lifetime, you must eliminate the effects of carrier diffusion.