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

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

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
StatePublished - 1 Jan 2020
EventPhotonics for Solar Energy Systems VIII 2020 - None, France
Duration: 6 Apr 202010 Apr 2020

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
Period6/04/2010/04/20

Keywords

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

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