N-Heterocyclic Olefin Type Ionic Liquid with Innate Soft Lewis-Base Character as an Effective Additive for Hybrid Quasi-2D and 3D Perovskite Solar Cells |
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| Authors: | Zhonggao Zhou Lihua Li Bolun Li Jing Li Tianyong Liu Xi Huang Shaobin Tang Hongdeng Qiu Wanzhu Cai Shiyong Zhang Kan Li Guohai Xu Hongyu Zhen |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Key Laboratory of Jiangxi University for Functional Materials Chemistry, Gannan Normal University, Ganzhou, 341000 China;2. College of Chemistry and Chemical Engineering, College of Materials Science and Engineering, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou, 350117 China;3. Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Guangdong Provincial Engineering Technology Research Center of Vacuum Coating Technologies and New Energy Materials, Siyuan Laboratory, Department of Physics, Jinan University, Guangzhou, 510632 China;4. College of Science, Key Laboratory of Quantum Precision Measurement of Zhejiang Province, Zhejiang University of Technology, Hangzhou, 310014 China |
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| Abstract: | In optimizing perovskites with ionic liquid (IL), the comparative study on Lewis acid-base (LAB) and hydrogen-bonding (HB) interactions between IL and perovskite is lacking. Herein, methyl is substituted for hydrogen on 2-position of imidazolium ring of N-heterocyclic carbene (NHC) type IL IdH to weaken HB interactions, and the resulting N-heterocyclic olefin (NHO) type IL IdMe with softer Lewis base character is studied in both hybrid quasi-2D (Q-2D) and 3D perovskites. It is revealed that IdMe participates in constructing high-quality Q-2D perovskite (n = 4) and provides stronger passivation for 3D perovskite compared with IdH. Power conversion efficiency (PCE) of Q-2D PEA2MA3Pb4I13 perovskite solar cells (PVSCs) is boosted to 17.68% from 14.03%. PCE and device stability of 3D PVSCs enhances simultaneously. Both theoretical simulations and experimental results show that LAB interactions between NHO and Pb2+ take the primary optimization effects on perovskite. The success of engineering LAB interactions also offers inspiration to develop novel ILs for high-performance PVSCs. |
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| Keywords: | density functional theory calculation ionic liquid additives Lewis acid-base interactions perovskite solar cells soft Lewis base |
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