State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University , Beijing 100871, People's Republic of China.
Co-Innovation Center for Micro/Nano Optoelectronic Materials and Devices, Chongqing University of Arts and Sciences , Yongchuan, Chongqing 402160, People's Republic of China.
ACS Appl Mater Interfaces. 2017 Aug 16;9(32):26915-26920. doi: 10.1021/acsami.7b07775. Epub 2017 Aug 7.
High-efficiency organic-inorganic hybrid perovskite solar cells have experienced rapid development and attracted significant attention in recent years. Crystal growth as an important factor would significantly influence the quality of perovskite films and ultimately the device performance, which usually requires thermal annealing for 10 min or more. Herein, we demonstrate a new method to get high crystallization of perovskite film by electric current annealing for just 5 s. In contrast to conventional thermal annealing, a homogeneous perovskite film was formed with larger grains and fewer pinholes, leading to a better performance of the device with higher open-circuit voltage and fill factor. An average power conversion efficiency of 17.02% with electric current annealing was obtained, which is higher than that of devices with a conventional thermal annealing process (16.05%). This facile electric current annealing process with less energy loss and time consumption shows great potential in the industrial mass production of photovoltaic devices.
高效的有机-无机杂化钙钛矿太阳能电池近年来发展迅速，引起了广泛关注。晶体生长是一个重要的因素，会显著影响钙钛矿薄膜的质量，最终影响器件性能，而这通常需要进行 10 分钟或更长时间的热退火。在此，我们展示了一种新的方法，只需 5 秒的电流退火即可获得高结晶度的钙钛矿薄膜。与传统的热退火相比，形成了具有更大晶粒和更少针孔的均匀钙钛矿薄膜，从而使器件具有更高的开路电压和填充因子，性能得到了改善。采用电流退火获得了 17.02%的平均功率转换效率，高于采用传统热退火工艺（16.05%）的器件。这种具有更少能量损失和时间消耗的简便电流退火工艺在光伏器件的工业大规模生产中具有很大的潜力。
