UV Degradation and Recovery of Perovskite Solar Cells

Sang Won Lee, Seongtak Kim, Soohyun Bae, Kyungjin Cho, Taewon Chung, Laura E. Mundt, Seunghun Lee, Sungeun Park, Hyomin Park, Martin C. Schubert, Stefan W. Glunz, Yohan Ko, Yongseok Jun, Yoon Mook Kang, Haeseok Lee, Donghwan Kim

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103 Citations (Scopus)

Abstract

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 J sc and EQE bounce-back phenomenon is attributed to the beneficial effects of PbI 2 which is generated by the decomposition of perovskite material.

Original languageEnglish
Article number38150
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 2016 Dec 2

ASJC Scopus subject areas

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    Lee, S. W., Kim, S., Bae, S., Cho, K., Chung, T., Mundt, L. E., Lee, S., Park, S., Park, H., Schubert, M. C., Glunz, S. W., Ko, Y., Jun, Y., Kang, Y. M., Lee, H., & Kim, D. (2016). UV Degradation and Recovery of Perovskite Solar Cells. Scientific Reports, 6, [38150]. https://doi.org/10.1038/srep38150