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Chemically Stable Black Phase CsPbI 3 Inorganic Perovskites for High‐Efficiency Photovoltaics
Author(s) -
Wang Yong,
Chen Yuetian,
Zhang Taiyang,
Wang Xingtao,
Zhao Yixin
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202001025
Subject(s) - perovskite (structure) , materials science , photovoltaics , phase (matter) , band gap , thermal stability , nanotechnology , chemical engineering , crystal (programming language) , energy conversion efficiency , optoelectronics , chemistry , photovoltaic system , organic chemistry , ecology , computer science , engineering , biology , programming language
Abstract Research on chemically stable inorganic perovskites has achieved rapid progress in terms of high efficiency exceeding 19% and high thermal stabilities, making it one of the most promising candidates for thermodynamically stable and high‐efficiency perovskite solar cells. Among those inorganic perovskites, CsPbI 3 with good chemical components stability possesses the suitable bandgap (≈1.7 eV) for single‐junction and tandem solar cells. Comparing to the anisotropic organic cations, the isotropic cesium cation without hydrogen bond and cation orientation renders CsPbI 3 exhibit unique optoelectronic properties. However, the unideal tolerance factor of CsPbI 3 induces the challenges of different crystal phase competition and room temperature phase stability. Herein, the latest important developments regarding understanding of the crystal structure and phase of CsPbI 3 perovskite are presented. The development of various solution chemistry approaches for depositing high‐quality phase‐pure CsPbI 3 perovskite is summarized. Furthermore, some important phase stabilization strategies for black phase CsPbI 3 are discussed. The latest experimental and theoretical studies on the fundamental physical properties of photoactive phase CsPbI 3 have deepened the understanding of inorganic perovskites. The future development and research directions toward achieving highly stable CsPbI 3 materials will further advance inorganic perovskite for highly stable and efficient photovoltaics.