UV degradation mechanism of TiO2-based perovskite solar cells studied by pump-probe spectroscopy

Chih Wei Luo, Anusha Puliparambil Thilakan, Jia Xin Li, Tzu Pei Chen, Shao Sian Li, Chun Wei Chen, Atsushi Yabushita, Minoru Osada, Kazuhito Tsukagoshi, Takayoshi Sasaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this study, the microscopic carrier dynamics that govern the UV stability of perovskite solar cells was investigated using pump-probe spectroscopy. In conventional perovskite solar cells, the UV-active oxygen vacancy in compact TiO2 prohibits current generation after UV degradation. On the other hand, the dominant vacancy type in 2D Ti1-xO2 atomic sheet transporting layer (ASTL) is a titanium vacancy, not UV-sensitive. Consequently, the carrier recombination are suppressed and further extends UV stability in perovskite solar cells with a 2D Ti1-xO2 ASTL. The dynamics of electron diffusion, electron injection, and hot hole transfer processes are found to be less sensitive to the UV irradiation. The ultrafast time-resolved data shown here clearly represent a close correlation between the carrier dynamics and UV aging of perovskite, thus providing insight into the origin of UV-induced degradation in perovskite solar cells.

Original languageEnglish
Title of host publicationPhotonics for Solar Energy Systems VIII
EditorsAlexander N. Sprafke, Jan Christoph Goldschmidt, Gregory Pandraud
PublisherSPIE
ISBN (Electronic)9781510635043
DOIs
Publication statusPublished - 2020 Jan 1
Externally publishedYes
EventPhotonics for Solar Energy Systems VIII 2020 - None, France
Duration: 2020 Apr 62020 Apr 10

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11366
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferencePhotonics for Solar Energy Systems VIII 2020
CountryFrance
CityNone
Period20/4/620/4/10

Keywords

  • Perovskite solar cells
  • Pump-probe spectroscopy
  • Ultrafast mechanism
  • UV-induced degradation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

    Luo, C. W., Thilakan, A. P., Li, J. X., Chen, T. P., Li, S. S., Chen, C. W., Yabushita, A., Osada, M., Tsukagoshi, K., & Sasaki, T. (2020). UV degradation mechanism of TiO2-based perovskite solar cells studied by pump-probe spectroscopy. In A. N. Sprafke, J. C. Goldschmidt, & G. Pandraud (Eds.), Photonics for Solar Energy Systems VIII [113660V] (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11366). SPIE. https://doi.org/10.1117/12.2554174