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Proceedings Paper

UV degradation mechanism of TiO2-based perovskite solar cells studied by pump-probe spectroscopy
Author(s): 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
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Paper 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.

Paper Details

Date Published: 1 April 2020
PDF: 8 pages
Proc. SPIE 11366, Photonics for Solar Energy Systems VIII, 113660V (1 April 2020);
Show Author Affiliations
Chih-Wei Luo, National Chiao Tung Univ. (Taiwan)
Anusha Puliparambil Thilakan, Vellore Institute of Technology (India)
Jia-Xin Li, National Chiao Tung Univ. (Taiwan)
Tzu-Pei Chen, National Taiwan Univ. (Taiwan)
Shao-Sian Li, Taipei Medical Univ. (Taiwan)
Chun-Wei Chen, National Taiwan Univ. (Taiwan)
Atsushi Yabushita, National Chiao Tung Univ. (Taiwan)
Minoru Osada, Nagoya Univ. (Japan)
National Institute for Materials Science (Japan)
Kazuhito Tsukagoshi, National Institute for Materials Science (Japan)
Takayoshi Sasaki, National Institute for Materials Science (Japan)

Published in SPIE Proceedings Vol. 11366:
Photonics for Solar Energy Systems VIII
Alexander N. Sprafke; Jan Christoph Goldschmidt; Gregory Pandraud, Editor(s)

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