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

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 proceeding › Conference 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 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.

Original language	English
Title of host publication	Photonics for Solar Energy Systems VIII
Editors	Alexander N. Sprafke, Jan Christoph Goldschmidt, Gregory Pandraud
Publisher	SPIE
ISBN (Electronic)	9781510635043
DOIs	https://doi.org/10.1117/12.2554174
Publication status	Published - 2020 Jan 1
Externally published	Yes
Event	Photonics for Solar Energy Systems VIII 2020 - None, France Duration: 2020 Apr 6 → 2020 Apr 10

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11366
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Photonics for Solar Energy Systems VIII 2020
Country	France
City	None
Period	20/4/6 → 20/4/10

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

Access to Document

10.1117/12.2554174

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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

UV degradation mechanism of TiO₂-based perovskite solar cells studied by pump-probe spectroscopy. / Luo, Chih Wei; Thilakan, Anusha Puliparambil; Li, Jia Xin; Chen, Tzu Pei; Li, Shao Sian; Chen, Chun Wei; Yabushita, Atsushi; Osada, Minoru; Tsukagoshi, Kazuhito; Sasaki, Takayoshi.

Photonics for Solar Energy Systems VIII. ed. / Alexander N. Sprafke; Jan Christoph Goldschmidt; Gregory Pandraud. SPIE, 2020. 113660V (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11366).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Luo, CW, Thilakan, AP, Li, JX, Chen, TP, Li, SS, Chen, CW, Yabushita, A, Osada, M, Tsukagoshi, K & Sasaki, T 2020, UV degradation mechanism of TiO₂-based perovskite solar cells studied by pump-probe spectroscopy. in AN Sprafke, JC Goldschmidt & G Pandraud (eds), Photonics for Solar Energy Systems VIII., 113660V, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11366, SPIE, Photonics for Solar Energy Systems VIII 2020, None, France, 20/4/6. https://doi.org/10.1117/12.2554174

Luo CW, Thilakan AP, Li JX, Chen TP, Li SS, Chen CW et al. UV degradation mechanism of TiO₂-based perovskite solar cells studied by pump-probe spectroscopy. In Sprafke AN, Goldschmidt JC, Pandraud G, editors, Photonics for Solar Energy Systems VIII. SPIE. 2020. 113660V. (Proceedings of SPIE - The International Society for Optical Engineering). https://doi.org/10.1117/12.2554174

Luo, Chih Wei ; Thilakan, Anusha Puliparambil ; Li, Jia Xin ; Chen, Tzu Pei ; Li, Shao Sian ; Chen, Chun Wei ; Yabushita, Atsushi ; Osada, Minoru ; Tsukagoshi, Kazuhito ; Sasaki, Takayoshi. / UV degradation mechanism of TiO₂-based perovskite solar cells studied by pump-probe spectroscopy. Photonics for Solar Energy Systems VIII. editor / Alexander N. Sprafke ; Jan Christoph Goldschmidt ; Gregory Pandraud. SPIE, 2020. (Proceedings of SPIE - The International Society for Optical Engineering).

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AU - Li, Jia Xin

AU - Chen, Tzu Pei

AU - Li, Shao Sian

AU - Chen, Chun Wei

AU - Yabushita, Atsushi

AU - Osada, Minoru

AU - Tsukagoshi, Kazuhito

AU - Sasaki, Takayoshi

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N2 - 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.

AB - 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.

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