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UV Degradation and Recovery of Perovskite Solar Cells

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...

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Detalles Bibliográficos
Autores principales: 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
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5133559/
https://www.ncbi.nlm.nih.gov/pubmed/27909338
http://dx.doi.org/10.1038/srep38150
Descripción
Sumario: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.