Korea University, Department of Materials Science and Engineering, Seoul, 136-713, Republic of Korea.
Fraunhofer Institute for Solar Energy Systems ISE, Freiburg, 79110, Germany.
Sci Rep. 2016 Dec 2;6:38150. doi: 10.1038/srep38150.
Although the power conversion efficiency of perovskite solar cells has increased from 3.81% to 22.1% in just 7 years, they still suffer from stability issues, as they degrade upon exposure to moisture, UV light, heat, and bias voltage. We herein examined the degradation of perovskite solar cells in the presence of UV light alone. The cells were exposed to 365 nm UV light for over 1,000 h under inert gas at <0.5 ppm humidity without encapsulation. 1-sun illumination after UV degradation resulted in recovery of the fill factor and power conversion efficiency. Furthermore, during exposure to consecutive UV light, the diminished short circuit current density (J) and EQE continuously restored. 1-sun light soaking induced recovery is considered to be caused by resolving of stacked charges and defect state neutralization. The J and EQE bounce-back phenomenon is attributed to the beneficial effects of PbI which is generated by the decomposition of perovskite material.
尽管钙钛矿太阳能电池的功率转换效率在短短 7 年内从 3.81%提高到了 22.1%，但它们仍然存在稳定性问题，因为它们会在暴露于水分、紫外光、热和偏置电压下降解。本文研究了在单独存在紫外光的情况下钙钛矿太阳能电池的降解情况。在惰性气体存在下，将电池在 <0.5 ppm 湿度下用 365nm 的紫外光照射 1000 小时以上，没有封装。紫外光降解后进行 1 太阳光照，填充因子和功率转换效率得到恢复。此外，在连续暴露于紫外光期间，短路电流密度（J）和外量子效率不断恢复。认为 1 太阳光浸泡诱导恢复是由堆积电荷的解决和缺陷态中和引起的。J 和 EQE 的反弹现象归因于由钙钛矿材料分解产生的 PbI 的有益效果。
