@article{oai:kyutech.repo.nii.ac.jp:00006096,
 author = {Yang,  Fu and Hirotani,  Daisuke and Kapil,  Gaurav and Kamarudin,  Muhammad Akmal and Ng,  Chi Huey and Zhang,  Yaohong and Shen,  Qing and Hayase, Shuzi and 早瀬, 修二},
 issue = {39},
 journal = {Angewandte Chemie International edition},
 month = {Aug},
 note = {01 August 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 CsPb1−xGexI2Br 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 (VOC) of 1.27 V in a planar solar cell based on CsPb0.8Ge0.2I2Br perovskite was achieved. Furthermore, the highest VOC up to 1.34 V was obtained by CsPb0.7Ge0.3I2Br perovskite, which is a remarkable record in the field of all‐inorganic perovskite solar cells. More importantly, all the photovoltaic parameters of CsPb0.8Ge0.2I2Br perovskite solar cells showed nearly no decay after 7 h measurement in 50–60 % relative humidity without encapsulation.},
 pages = {12745--12749},
 title = {All‐Inorganic CsPb1−xGexI2Br Perovskite with Enhanced Phase Stability and Photovoltaic Performance},
 volume = {57},
 year = {2018},
 yomi = {ハヤセ, シュウジ}
}