Improved Crystallization of Perovskite Films by Optimized Solvent Annealing for High Efficiency Solar Cell

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• 作者：Jiang Liu ; Cheng Gao ; Xulin He ; Qinyan Ye ; Liangqi Ouyang ; Daming Zhuang ; Cheng Liao ; Jun Mei ; Woonming Lau
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：November 4, 2015
• 年：2015
• 卷：7
• 期：43
• 页码：24008-24015
• 全文大小：452K
• ISSN：1944-8252

文摘

Organic鈥搃norganic halide perovskite-based thin film solar cells show excellent light-to-power conversion efficiency. The high performance for the devices requires the preparation of well-crystallized perovskite absorbers. In this paper, we used the postannealing process to treat the perovskite films under different solvent vapors and observed that the solvent vapors have a strong effect on the film growth. A model regarding the perovskite film growth was proposed as well. Intensive characterizations including scanning electron microscopy, electrochemical impedance spectroscopy, and admittance spectroscopy allowed us to attribute the improved performance to reduced recombination loss and defect density. Solar cell based on the DMSO-treated films delivered a power conversion efficiency of over 13% with negligible photocurrent hysteresis.