Co-Solvent Engineering Contributing to Achieve High-Performance Perovskite Solar Cells and Modules Based on Anti-Solvent Free Technology |
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Authors: | Gu Li Zhen Wang Yuqi Wang Zhengchi Yang Pengyu Dong Yancong Feng Yue Jiang Shien-Ping Feng Guofu Zhou Jun-Ming Liu Jinwei Gao |
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Affiliation: | 1. Institute for Advanced Materials & Guangdong Provincial Key Laboratory of Optical, Information Materials and Technology, South China Academy of Advanced, Optoelectronics, South China Normal University, Guangzhou, 510006 China;2. Guangdong Provincial Key Laboratory of Optical Information Materials and, Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006 China;3. Department of Advanced Design and Systems Engineering, City University of Hong Kong, Hong Kong, 999077 China;4. Laboratory of Solid-State Microstructures, Nanjing University, Nanjing, 210093 China |
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Abstract: | The pinhole-free and defect-less perovskite film is crucial for achieving high efficiency and stable perovskite solar cells (PSCs), which can be prepared by widely used anti-solvent crystallization strategies. However, the involvement of anti-solvent requires precise control and inevitably brings toxicity in fabrication procedures, which limits its large-scale industrial application. In this work, a facile and effective co-solvent engineering strategy is introduced to obtain high- quality perovskite film while avoiding the usage of anti-solvent. The uniform and compact perovskite polycrystalline films have been fabricated through the addition of co-solvent that owns strong coordination capacity with perovskite components , meanwhile possessing the weaker interaction with main solvent . With those strategies, a champion power conversion efficiency (PCE) of 22% has been achieved with the optimal co-solvent, N-methylpyrrolidone (NMP) and without usage of anti-solvent. Subsequently, PSCs based on NMP show high repeatability and good shelf stability (80% PCE remains after storing in ambient condition for 30 days). Finally, the perovskite solar module (5 × 5 cm) with 7 subcells connects in series yielding champion PCE of 16.54%. This strategy provides a general guidance of co-solvent selection for PSCs based on anti-solvent free technology and promotes commercial application of PSCs. |
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Keywords: | anti-solvent free co-solvent engineering intermolecular interaction modules perovskite solar cells |
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