Synergic Interface Optimization with Green Solvent Engineering in Mixed Perovskite Solar Cells |
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| Authors: | Tongle Bu Lan Wu Xueping Liu Xiaokun Yang Peng Zhou Xinxin Yu Tianshi Qin Jiangjian Shi Song Wang Saisai Li Zhiliang Ku Yong Peng Fuzhi Huang Qingbo Meng Yi‐Bing Cheng Jie Zhong |
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| Institution: | 1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, P. R. China;2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, P. R. China;3. Key Laboratory of Flexible Electronics & Institute of Advanced Materials, Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, P. R. China;4. Key Laboratory for Renewable Energy, Chinese Academy of Sciences, Beijing, P. R. China;5. Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices, Hubei University of Arts and Science, Xiangyang, P. R. China;6. Department of Materials Science and Engineering, Monash University, VIC, Australia |
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| Abstract: | Organic–inorganic hybrid halide perovskite solar cells (PSCs) have recently drawn enormous attentions due to their impressive performance (>22%) and low temperature solution processability (<150 °C). Current solution process involves application of a large amount of toxic solvents, such as chlorobenzene, which is heavily employed in both the perovskite layer and the hole transport layer (HTL) deposition. Herein, this study employs green solvent of ethyl acetate for engineering efficient perovskite and HTL layers, which enables a synergic interface (perovskite/HTL) optimization. A champion efficiency of 19.43% is obtained for small cells (0.16 cm2 with mask) and over 14% for large size modules (5 × 5 cm2). The PSCs prepared from the green solvent engineering demonstrate superior performance on both efficiency and stability over their chlorobenzene counterparts. These enhancements are ascribed to the in situ inhibition on carrier recombination induced by interfacial defects during the solution processing, which enables about 2/3 reduction of calculated recombination rate. Thus, the green solvent route shows the great potential toward environmental‐friendly manufacturing. |
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| Keywords: | green solvents interface optimization large size modules mixed perovskite Spiro‐OMeTAD |
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