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All‐Inorganic CsPb 1− x Ge x I 2 Br Perovskite with Enhanced Phase Stability and Photovoltaic Performance
Author(s) -
Yang Fu,
Hirotani Daisuke,
Kapil Gaurav,
Kamarudin Muhammad Akmal,
Ng Chi Huey,
Zhang Yaohong,
Shen Qing,
Hayase Shuzi
Publication year - 2018
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201807270
Subject(s) - perovskite (structure) , orthorhombic crystal system , materials science , energy conversion efficiency , glovebox , open circuit voltage , relative humidity , phase (matter) , solar cell , thermal stability , perovskite solar cell , chemical engineering , chemistry , crystallography , crystal structure , optoelectronics , organic chemistry , voltage , physics , quantum mechanics , engineering , thermodynamics
Compared with organic‐inorganic perovskites, all‐inorganic cesium‐based perovskites without volatile organic compounds have gained extensive interests because of the high thermal stability. However, they have a problem on phase transition from cubic phase (active for photo‐electric conversion) to orthorhombic phase (inactive for photo‐electric conversion) at room temperature, which has hindered further progress. Herein, novel inorganic CsPb 1− x Ge x I 2 Br perovskites were prepared in humid ambient atmosphere without a glovebox. The phase stability of the all‐inorganic perovskite was effectively enhanced after germanium addition. In addition, the highest power conversion efficiency of 10.8 % with high open‐circuit voltage ( V OC ) of 1.27 V in a planar solar cell based on CsPb 0.8 Ge 0.2 I 2 Br perovskite was achieved. Furthermore, the highest V OC up to 1.34 V was obtained by CsPb 0.7 Ge 0.3 I 2 Br perovskite, which is a remarkable record in the field of all‐inorganic perovskite solar cells. More importantly, all the photovoltaic parameters of CsPb 0.8 Ge 0.2 I 2 Br perovskite solar cells showed nearly no decay after 7 h measurement in 50–60 % relative humidity without encapsulation.