All‐Inorganic CsPb1−xGexI2Br Perovskite with Enhanced Phase Stability and Photovoltaic Performance |
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| Authors: | Fu Yang Daisuke Hirotani Dr Gaurav Kapil Dr Muhammad Akmal Kamarudin Dr Chi Huey Ng Dr Yaohong Zhang Prof Dr Qing Shen Prof Dr Shuzi Hayase |
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| Institution: | 1. Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, Kitakyushu, Japan;2. Department Graduate School of Informatics and Engineering, University of Electro-Communications, Chofu, Tokyo, Japan |
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| Abstract: | 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. |
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| Keywords: | germanium iodide inorganic perovskites lead substitutes phase stability solar cells |
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