Bandgap adjustment assisted preparation of >18% CsyFA1−yPbIxBr3−x-based perovskite solar cells using a hybrid spraying process |
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| Authors: | Shengquan Fu Yueyue Xiao Xinxin Yu Tianxing Xiang Fei Long Junyan Xiao Zhiliang Ku Jie Zhong Wei Li Fuzhi Huang Yong Peng Yibing Cheng |
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| Affiliation: | State Key Lab of Advanced Technologies for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070 P. R. China.; Wuhan University of Technology Advanced Engineering Technology Research Institute of Zhongshan City, Zhongshan 528400 P. R. China ; Guangxi Key Lab Opt & Elect Mat & Devices, Coll Mat Sci & Engn, Guilin University Technology, Guilin 541004 P. R. China |
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| Abstract: | The preparation of CsyFA1−yPbIxBr3−x-based perovskite by ultrasonic spraying has valuable application in the preparation of tandem solar cells on textured substrates due to its excellent stability and the advantages of large-area uniform preparation from the spraying technology. However, the bandgap of perovskite prepared by spraying method is difficult to adjust, and perovskites with a wide bandgap have the issue of phase instability. Here, we improved the crystallinity of the perovskite by simply controlling the post-annealing temperature. The results show that perovskite film prepared by hybrid spray method has the best crystallinity and device performance at a post-annealing temperature of 170 °C. On this basis, the bandgap of perovskite was changed from 1.53 eV to 1.76 eV by controlling the ratio of the organic halogen precursor solution. When the bandgap is 1.57 eV, a perovskite solar cell with an efficiency of 18.31% is obtained.High-efficiency perovskite solar cells with good grain morphology and adjustable band gap were prepared by ultrasonic spray. |
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