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Crystallization Regulation by Self-Assembling Liquid Crystal Template Enables Efficient and Stable Perovskite Solar Cells |
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| Authors: | Meizi Wu Hongyan Wang Yong Li Dr Ran Chen Hui Zhou Shaomin Yang Dongfang Xu Kun Li Prof Dr Zhongwei An Shengzhong |
| Institution: | 1. Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education;2. Shaanxi Key Laboratory for Advanced Energy Devices;3. Shaanxi Engineering Lab for Advanced Energy Technology;4. International Joint Research Center of Shaanxi Province for Photoelectric Materials Science;5. School of Materials Science & Engineering, Shaanxi Normal University, Xi'an, 710119 P. R. China
Contribution: Data curation (lead), Formal analysis (lead), Investigation (lead), Writing - original draft (lead);6. School of Materials Science & Engineering, Shaanxi Normal University, Xi'an, 710119 P. R. China Contribution: Data curation (equal), Formal analysis (equal);7. School of Materials Science & Engineering, Shaanxi Normal University, Xi'an, 710119 P. R. China Contribution: Data curation (equal), Investigation (equal);8. School of Materials Science and Engineering, Xi' an University of Science and Technology, Xi'an, 710054 P. R. China;9. School of Materials Science & Engineering, Shaanxi Normal University, Xi'an, 710119 P. R. China Contribution: Formal analysis (equal), Investigation (equal);10. School of Materials Science & Engineering, Shaanxi Normal University, Xi'an, 710119 P. R. China Contribution: Methodology (equal);11. School of Materials Science & Engineering, Shaanxi Normal University, Xi'an, 710119 P. R. China Contribution: Data curation (equal);12. School of Materials Science & Engineering, Shaanxi Normal University, Xi'an, 710119 P. R. China Contribution: Investigation (equal);13. School of Materials Science & Engineering, Shaanxi Normal University, Xi'an, 710119 P. R. China |
| Abstract: | It is found that the disordered growth of bottom perovskite film deteriorates the buried interface of perovskite solar cells (PSCs), so developing a new material to modify the buried interface for regulating the crystal growth and defect passivation is an effective approach for improving the photovoltaic performance of PSCs. Here, we developed a new ionic liquid crystal (ILC, 1-Dodecyl-3-methylimidazolium tetrafluoroborate) as both crystal regulator and defect passivator to modify the buried interface of PSCs. The high lattice matching between this ILC and perovskite promotes preferential growth of perovskite film along 001] direction, while the oriented ILC with mesomorphic phase has a strong chemical interaction with perovskite to passivate the interface defect, as a result, the modified buried interface exhibits suppressed defects, improved band alignment, reduced nonradiative recombination losses, and enhanced charge extraction. The ILC-modified PSC delivers a power conversion efficiency of 24.92 % and maintains 94 % of the original value after storage in ambient for 3000 h. |
| Keywords: | Crystallization Regulation Ionic Liquid Crystals Perovskite Solar Cells Self-Assembling |