文章基本信息

标题：Structural fluctuations cause spin-split states in tetragonal (CH3NH3)PbI3 as evidenced by the circular photogalvanic effect
作者：Daniel Niesner ; Martin Hauck ; Shreetu Shrestha 等
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2018
卷号：115
期号：38
页码：9509-9514
DOI：10.1073/pnas.1805422115
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Lead halide perovskites are used in thin-film solar cells, which owe their high efficiency to the long lifetimes of photocarriers. Various calculations find that a dynamical Rashba effect could significantly contribute to these long lifetimes. This effect is predicted to cause a spin splitting of the electronic bands of inversion-symmetric crystalline materials at finite temperatures, resulting in a slightly indirect band gap. Direct experimental evidence of the existence or the strength of the spin splitting is lacking. Here, we resonantly excite photocurrents in single crystalline (
关键词：organic–inorganic perovskite ; lead halide perovskite ; circular photogalvanic effect ; dynamical Rashba ; Rashba effect