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

doi:10.1117/12.2554174

1 April 2020 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

Author Affiliations +

Proceedings Volume 11366, Photonics for Solar Energy Systems VIII; 113660V (2020) https://doi.org/10.1117/12.2554174
Event: SPIE Photonics Europe, 2020, Online Only

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 Ti_1-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 Ti_1-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.

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Chih-Wei Luo, Anusha Puliparambil Thilakan, Jia-Xin Li, Tzu-Pei Chen, Shao-Sian Li, Chun-Wei Chen, Atsushi Yabushita, Minoru Osada, Kazuhito Tsukagoshi, and Takayoshi Sasaki "UV degradation mechanism of TiO₂-based perovskite solar cells studied by pump-probe spectroscopy", Proc. SPIE 11366, Photonics for Solar Energy Systems VIII, 113660V (1 April 2020); https://doi.org/10.1117/12.2554174

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