Superior Photovoltaic Properties of Lead Halide Perovskites: Insights from First-Principles Theory

被引:262
作者
Yin, Wan-Jian
Shi, Tingting
Yan, Yanfa [1 ]
机构
[1] Univ Toledo, Dept Phys & Astron, Toledo, OH 43606 USA
关键词
INORGANIC HOLE CONDUCTOR; SOLAR-CELL; IODIDE PEROVSKITE; ELECTRONIC-PROPERTIES; EFFICIENT; TRANSPORT; DEFECTS; SEMICONDUCTOR; RECOMBINATION; PERFORMANCE;
D O I
10.1021/jp512077m
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Organic-inorganic methylammonium lead halide perovskites have recently emerged as promising solar photovoltaic absorbers. In this Feature Article, we review out theoretical understanding of the superior photovoltaic properties, such as the extremely high optical absorption coefficient and verylong carrier diffusion length of CH3NH3PbI3 perovskites through first-principles theory. We elucidate that the superior photovoltaic properties are attributed to the combination of direct band gap p-p transitions enabled-by the Pb lone-pair s orbitals and perovskite symmetry, high iconicity, large lattice constant, and strong antibonding coupling,between lone-pairs and I p orbitals. We show that CH3NH3PbI3 exhibits intrinsic ainbipolar self-doping behavior with conductivities tunable from p-type to n-type via controlling the growth conditions. We show that the p-type conductivity can be further improved by: incorporating some group IA, IB, or VIA elements at I-rich/Pb-poor growth conditions. However, the n-type conductivity cannot be improved under thermal equilibrium growth conditions through extrinsic doping due to the compensation from intrinsic pint defects.
引用
收藏
页码:5253 / 5264
页数:12
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