UV Degradation and Recovery of Perovskite Solar Cells

作者：Lee Sang Won; Kim Seongtak; Bae Soohyun; Cho Kyungjin; Chung Taewon; Mundt Laura E; Lee Seunghun; Park Sungeun; Park Hyomin; Schubert Martin C; Glunz Stefan W; Ko Yohan; Jun Yongseok; Kang Yoonmook; Lee Hae Seok; Kim Donghwan

来源：Scientific Reports, 2016, 6(1): 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(sc)) 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 Jsc and EQE bounce-back phenomenon is attributed to the beneficial effects of PbI2 which is generated by the decomposition of perovskite material.

• 出版日期2016-12-2