title: UV Degradation and Recovery of Perovskite Solar Cells.
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 (Jsc) 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 Jscand EQE bounce-back phenomenon is attributed to the beneficial effects of PbI2which is generated by the decomposition of perovskite material.
authors.affiliation: Korea University, Department of Materials Science and Engineering, Seoul, 136-713, Republic of Korea.
authors.forename: Sang-Won
authors.initials: SW
authors.lastname: Lee
authors.affiliation: Korea University, Department of Materials Science and Engineering, Seoul, 136-713, Republic of Korea.
authors.forename: Seongtak
authors.initials: S
authors.lastname: Kim
authors.affiliation: Korea University, Department of Materials Science and Engineering, Seoul, 136-713, Republic of Korea.
authors.forename: Soohyun
authors.initials: S
authors.lastname: Bae
authors.affiliation: Korea University, Department of Materials Science and Engineering, Seoul, 136-713, Republic of Korea.
authors.forename: Kyungjin
authors.initials: K
authors.lastname: Cho
authors.affiliation: Korea University, Department of Materials Science and Engineering, Seoul, 136-713, Republic of Korea.
authors.forename: Taewon
authors.initials: T
authors.lastname: Chung
authors.affiliation: Fraunhofer Institute for Solar Energy Systems ISE, Freiburg, 79110, Germany.
authors.forename: Laura E
authors.initials: LE
authors.lastname: Mundt
authors.affiliation: Korea University, Department of Materials Science and Engineering, Seoul, 136-713, Republic of Korea.|Fraunhofer Institute for Solar Energy Systems ISE, Freiburg, 79110, Germany.
authors.forename: Seunghun
authors.initials: S
authors.lastname: Lee
authors.affiliation: Korea University, Department of Materials Science and Engineering, Seoul, 136-713, Republic of Korea.|Fraunhofer Institute for Solar Energy Systems ISE, Freiburg, 79110, Germany.
authors.forename: Sungeun
authors.initials: S
authors.lastname: Park
authors.affiliation: Korea University, Department of Materials Science and Engineering, Seoul, 136-713, Republic of Korea.
authors.forename: Hyomin
authors.initials: H
authors.lastname: Park
authors.affiliation: Fraunhofer Institute for Solar Energy Systems ISE, Freiburg, 79110, Germany.
authors.forename: Martin C
authors.initials: MC
authors.lastname: Schubert
authors.affiliation: Fraunhofer Institute for Solar Energy Systems ISE, Freiburg, 79110, Germany.|University Freiburg, Laboratory for Photovoltaic Energy Conversion, Freiburg, 79110, Germany.
authors.forename: Stefan W
authors.initials: SW
authors.lastname: Glunz
authors.affiliation: Konkuk University, Department of Materials Chemistry and Engineering, Seoul, 143-701, Republic of Korea.
authors.forename: Yohan
authors.initials: Y
authors.lastname: Ko
authors.affiliation: Konkuk University, Department of Materials Chemistry and Engineering, Seoul, 143-701, Republic of Korea.
authors.forename: Yongseok
authors.initials: Y
authors.lastname: Jun
authors.affiliation: KU·KIST Green School, Graduate School of Energy and Environment, Korea University, Seoul, 136-713, Republic of Korea.
authors.forename: Yoonmook
authors.initials: Y
authors.lastname: Kang
authors.affiliation: KU·KIST Green School, Graduate School of Energy and Environment, Korea University, Seoul, 136-713, Republic of Korea.
authors.forename: Hae-Seok
authors.initials: HS
authors.lastname: Lee
authors.affiliation: Korea University, Department of Materials Science and Engineering, Seoul, 136-713, Republic of Korea.
authors.forename: Donghwan
authors.initials: D
authors.lastname: Kim