Thermally Crosslinked F-rich Polymer to Inhibit Lead Leakage for Sustainable Perovskite Solar Cells and Modules |
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| Authors: | Jiakang Zhang Zhipeng Li Fengjuan Guo Haokun Jiang Wenjian Yan Cheng Peng Ruixin Liu Prof Li Wang Prof Hongtao Gao Prof Shuping Pang Prof Zhongmin Zhou |
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| Institution: | 1. College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, 266042 Qingdao, P. R. China;2. Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, 266101 Qingdao, P. R. China;3. College of Materials Science and Engineering, Qingdao University of Science and Technology, 266042 Qingdao, P. R. China |
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| Abstract: | High-performance perovskite solar cells have demonstrated commercial viability, but still face the risk of contamination from lead leakage and long-term stability problems caused by defects. Here, an organic small molecule (octafluoro-1,6-hexanediol diacrylate) is introduced into the perovskite film to form a polymer through in situ thermal crosslinking, of which the carbonyl group anchors the uncoordinated Pb2+ of perovskite and reduces the leakage of lead, along with the −CF2− hydrophobic group protecting the Pb2+ from water invasion. Additionally, the polymer passivates varieties of Pb-related and I-related defects through coordination and hydrogen bonding interactions, regulating the crystallization of perovskite film with reduced trap density, releasing lattice strain, and promoting carrier transport and extraction. The optimal efficiencies of polymer-incorporated devices are 24.76 % (0.09 cm2) and 20.66 % (14 cm2). More importantly, the storage stability, thermal stability, and operational stability have been significantly improved. |
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| Keywords: | Perovskite Solar Cells Lead Leakage Crosslink Defect Passivation |
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