中国物理B ›› 2015, Vol. 24 ›› Issue (11): 116302-116302.doi: 10.1088/1674-1056/24/11/116302

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Nature of the band gap of halide perovskites ABX3 (A= CH3NH3, Cs; B= Sn, Pb; X= Cl, Br, I): First-principles calculations

袁野a, 徐闰a, 徐海涛a, 洪峰b, 徐飞b, 王林军a   

  1. a School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
    b Department of Physics, Shanghai University, Shanghai 200444, China
  • 收稿日期:2015-03-26 修回日期:2015-06-14 出版日期:2015-11-05 发布日期:2015-11-05
  • 通讯作者: Xu Run E-mail:runxu@staff.shu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11375112).

Nature of the band gap of halide perovskites ABX3 (A= CH3NH3, Cs; B= Sn, Pb; X= Cl, Br, I): First-principles calculations

Yuan Ye (袁野)a, Xu Run (徐闰)a, Xu Hai-Tao (徐海涛)a, Hong Feng (洪峰)b, Xu Fei (徐飞)b, Wang Lin-Jun (王林军)a   

  1. a School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
    b Department of Physics, Shanghai University, Shanghai 200444, China
  • Received:2015-03-26 Revised:2015-06-14 Online:2015-11-05 Published:2015-11-05
  • Contact: Xu Run E-mail:runxu@staff.shu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11375112).

摘要: The electronic structures of cubic structure of ABX3 (A= CH3NH3,Cs; B= Sn, Pb; X= Cl, Br, I) are analyzed by density functional theory using the Perdew-Burke-Ernzerhof exchange-correlation functional and using the Heyd-Scuseria-Ernzerhof hybrid functional. The valence band maximum (VBM) is found to be made up by an antibonding hybridization of B s and X p states, whereas bands made up by the π antibonding of B p and X p states dominates the conduction band minimum (CBM). The changes of VBM, CBM, and band gap with ion B and X are then systematically summarized. The natural band offsets of ABX3 are partly given. We also found for all the ABX3 perovskite materials in this study, the bandgap increases with an increasing lattice parameter. This phenomenon has good consistency with the experimental results.

关键词: first-principles theory, electron density of states, band structure of crystalline solids, organic-inorganic hybrid nanostructures

Abstract: The electronic structures of cubic structure of ABX3 (A= CH3NH3,Cs; B= Sn, Pb; X= Cl, Br, I) are analyzed by density functional theory using the Perdew-Burke-Ernzerhof exchange-correlation functional and using the Heyd-Scuseria-Ernzerhof hybrid functional. The valence band maximum (VBM) is found to be made up by an antibonding hybridization of B s and X p states, whereas bands made up by the π antibonding of B p and X p states dominates the conduction band minimum (CBM). The changes of VBM, CBM, and band gap with ion B and X are then systematically summarized. The natural band offsets of ABX3 are partly given. We also found for all the ABX3 perovskite materials in this study, the bandgap increases with an increasing lattice parameter. This phenomenon has good consistency with the experimental results.

Key words: first-principles theory, electron density of states, band structure of crystalline solids, organic-inorganic hybrid nanostructures

中图分类号:  (First-principles theory)

  • 63.20.dk
71.20.-b (Electron density of states and band structure of crystalline solids) 81.07.Pr (Organic-inorganic hybrid nanostructures)