All-Inorganic CsPb1−xGexI2Br Perovskite with Enhanced Phase Stability and Photovoltaic Performance
Corresponding Author
Fu Yang
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorDaisuke Hirotani
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorDr. Gaurav Kapil
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorDr. Muhammad Akmal Kamarudin
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorDr. Chi Huey Ng
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorDr. Yaohong Zhang
Department Graduate School of Informatics and Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585 Japan
Search for more papers by this authorProf. Dr. Qing Shen
Department Graduate School of Informatics and Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585 Japan
Search for more papers by this authorCorresponding Author
Prof. Dr. Shuzi Hayase
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorCorresponding Author
Fu Yang
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorDaisuke Hirotani
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorDr. Gaurav Kapil
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorDr. Muhammad Akmal Kamarudin
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorDr. Chi Huey Ng
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorDr. Yaohong Zhang
Department Graduate School of Informatics and Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585 Japan
Search for more papers by this authorProf. Dr. Qing Shen
Department Graduate School of Informatics and Engineering, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585 Japan
Search for more papers by this authorCorresponding Author
Prof. Dr. Shuzi Hayase
Graduate School of Life Science and Systems Engineering Institution, Kyushu Institute of Technology, 2-4 Hibikino Wakamatsu-ku, Kitakyushu, 808-0196 Japan
Search for more papers by this authorGraphical Abstract
Germanium is for the first time reported to incorporate in all-inorganic CsPbI2Br perovskite and lead to enhanced phase stability and photovoltaic performance. A large VOC of up to 1.34 V and a high PCE of 10.8 % were achieved by planar perovskite solar cells (PSCs) that were prepared in an uncontrolled humid air atmosphere without a glovebox, which are remarkable records for the CsPbI2Br PSCs.
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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