Thermodynamically Stable Orthorhombic γ-CsPbI3 Thin Films for High-Performance Photovoltaics

Journal of the American Chemical Society
Boya ZhaoJin-Song Hu

Abstract

All-inorganic lead halide perovskites demonstrate improved thermal stability over the organic-inorganic halide perovskites, but the cubic α-CsPbI3 with the most appropriate bandgap for light harvesting is not structurally stable at room temperature and spontaneously transforms into the undesired orthorhombic δ-CsPbI3. Here, we present a new member of black-phase thin films of all-inorganic perovskites for high-efficiency photovoltaics, the orthorhombic γ-CsPbI3 thin films with intrinsic thermodynamic stability and ideal electronic structure. Exempt from introducing organic ligands or incorporating mixed cations/anions into the crystal lattice, we stabilize the γ-CsPbI3 thin films by a simple solution process in which a small amount of H2O manipulates the size-dependent phase formation through a proton transfer reaction. Theoretical calculations coupled with experiments show that γ-CsPbI3 with a lower surface free energy becomes thermodynamically preferred over δ-CsPbI3 at surface areas greater than 8600 m2/mol and exhibits comparable optoelectronic properties to α-CsPbI3. Consequently, γ-CsPbI3-based solar cells display a highly reproducible efficiency of 11.3%, among the highest records for CsPbI3 thin-film solar cells, with r...Continue Reading

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Citations

Apr 2, 2019·Physical Chemistry Chemical Physics : PCCP·Robert A EvarestovJoachim Maier
May 18, 2019·Physical Chemistry Chemical Physics : PCCP·Jiajia ZhangRenyong Liu
Mar 13, 2019·Angewandte Chemie·Jingru ZhangShengzhong Frank Liu
Feb 28, 2020·Physical Chemistry Chemical Physics : PCCP·Dhana Lakshmi BusipalliJyh-Chiang Jiang
Jul 26, 2019·Nanoscale·Jing ZhuangJizheng Wang
Jan 17, 2020·The Journal of Chemical Physics·P V G M RathnayakeAsaph Widmer-Cooper
Nov 16, 2018·Nature Communications·Weijun KeMercouri G Kanatzidis
Jul 28, 2019·Science·Julian A SteeleMaarten B J Roeffaers
Feb 27, 2021·Advanced Materials·Julian A SteeleMaarten B J Roeffaers
Jun 3, 2021·Nanomaterials·Ioannis DeretzisAlessandra Alberti
Jul 2, 2021·Journal of the American Chemical Society·Julian A SteeleMaarten B J Roeffaers
Jul 21, 2021·The Journal of Physical Chemistry Letters·Chenggang YangXiaoliang Liu
Aug 8, 2021·Nanomaterials·Jessica SattaPier Carlo Ricci
May 7, 2020·The Journal of Physical Chemistry Letters·Jongseob KimKi-Ha Hong
Oct 23, 2019·Journal of the American Chemical Society·Shun-Chang LiuJin-Song Hu
Jul 10, 2019·Journal of the American Chemical Society·Daniel B StrausRobert J Cava
Feb 6, 2020·The Journal of Physical Chemistry Letters·Meng ZhouHe Wang
Nov 9, 2021·The Journal of Physical Chemistry Letters·Xiaolin ZhangXiuting Li

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