A facile, solvent vapor-fumigation-induced, self-repair recrystallization of CH3NH3PbI3 films for high-performance perovskite solar cells
A facile, solvent vapor-fumigation-induced, self-repair recrystallization of CH3NH3PbI3 films for high-performance perovskite solar cells
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用于高性能钙钛矿太阳能电池的 CH3NH3PbI3 薄膜的简便、溶剂蒸汽熏蒸诱导的自修复重结晶
DOI：
10.1039/c5nr00225g
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发表时间：
2015
期刊：
影响因子：
6.7
通讯作者：
Zou Zhigang
中科院分区：
文献类型：
--
作者：
Zhu Weidong;Yu Tao;Li Faming;Bao Chunxiong;Gao Hao;Yi Yong;Yang Jie;Fu Gao;Zhou Xiaoxin;Zou Zhigang
高质量的CH 3 NH3 PbI 3薄膜在高性能钙钛矿太阳能电池的制造中至关重要。在这里，一个重结晶过程中，通过方便的熏蒸与DMF蒸汽已成功地引入到自修复的CH 3 NH3 PbI 3薄膜的覆盖率差，结晶度低，常用的一步旋涂法制备。研究发现，通过调节再结晶过程的循环次数，可以使具有树枝状结构的CH_3NH_3PbI_3薄膜自发地转变为具有全覆盖和高结晶度的均匀薄膜。基于这些修复的CH 3 NH3 PbI 3膜的介观结构的钙钛矿太阳能电池显示出可再现的最佳功率转换效率（PCE）为11.15%，平均PCE为10.25 ± 0.90%，这比基于未修复的CH 3 NH3 PbI 3膜的器件好得多。此外，优化后的器件由于薄膜质量的提高，电流-电压测试中的迟滞现象也得到了有效的缓解。我们的工作证明了溶剂蒸气的熏蒸可以修饰金属有机钙钛矿薄膜，如CH_3 NH_3 PbI_3。它为制造高性能钙钛矿太阳能电池提供了一种新颖而有吸引力的方法。
A high-quality CH3NH3PbI3 film is crucial in the manufacture of a high-performance perovskite solar cell. Here, a recrystallization process via facile fumigation with DMF vapor has been successfully introduced to self-repair of CH3NH3PbI3 films with poor coverage and low crystallinity prepared by the commonly used one-step spin-coating method. We found that the CH3NH3PbI3 films with dendritic structures can spontaneously transform to the uniform ones with full coverage and high crystallinity by adjusting the cycles of the recrystallization process. The mesostructured perovskite solar cells based on these repaired CH3NH3PbI3 films showed reproducible optimal power conversion efficiency (PCE) of 11.15% and average PCE of 10.25 ± 0.90%, which are much better than that of devices based on the non-repaired CH3NH3PbI3 films. In addition, the hysteresis phenomenon in the current–voltage test can also be effectively alleviated due to the quality of the films being improved in the optimized devices. Our work proved that the fumigation of solvent vapor can modify metal organic perovskite films such as CH3NH3PbI3. It offers a novel and attractive way to fabricate high-performance perovskite solar cells.