First-Principles Study of Lead Iodide Perovskite Tetragonal and Orthorhombic Phases for Photovoltaics

被引:226
作者
Geng, Wei [1 ]
Zhang, Le [1 ]
Zhang, Yan-Ning [1 ,2 ]
Lau, Woon-Ming [1 ,2 ]
Liu, Li-Min [1 ]
机构
[1] Beijing Computat Sci Res Ctr, Beijing 100084, Peoples R China
[2] Chengdu Green Energy & Green Mfg Technol R&D Ctr, Chengdu 610207, Sichuan, Peoples R China
基金
中国国家自然科学基金;
关键词
INITIO MOLECULAR-DYNAMICS; SOLAR-CELL; HALIDE PEROVSKITES; LOW-COST; LIGHT; SENSITIZERS; INTERPLAY;
D O I
10.1021/jp504951h
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
Methylammonium lead iodide perovskite, CH3NH3PbI3, has attracted particular attention because of its fast increase in efficiency as solid-state solar cells. We performed first-principles calculations with the nonlocal van der Waals (vdW) correlation to investigate the crystal structures and electronic and optical properties of CH3NH3PbI3. The calculated results show that the distribution of methylammonium ions, which further changes the vdW interaction and hydrogen bonds of organic and inorganic matrixes, plays a vital role in both the geometry stability and the electronic structure. The vdW correlation is critical to provide appropriate descriptions of the interaction between the organic and the inorganic parts. The phase transformation from orthorhombic to tetragonal phase causes the decrease of the band gap and the red shift of the optical absorption coefficient.
引用
收藏
页码:19565 / 19571
页数:7
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