TY - GEN
T1 - UV degradation mechanism of TiO2-based perovskite solar cells studied by pump-probe spectroscopy
AU - Luo, Chih Wei
AU - Thilakan, Anusha Puliparambil
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
N1 - Publisher Copyright:
© 2020 SPIE.
PY - 2020
Y1 - 2020
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.
KW - Perovskite solar cells
KW - Pump-probe spectroscopy
KW - UV-induced degradation
KW - Ultrafast mechanism
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U2 - 10.1117/12.2554174
DO - 10.1117/12.2554174
M3 - Conference contribution
AN - SCOPUS:85085307936
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Photonics for Solar Energy Systems VIII
A2 - Sprafke, Alexander N.
A2 - Goldschmidt, Jan Christoph
A2 - Pandraud, Gregory
PB - SPIE
T2 - Photonics for Solar Energy Systems VIII 2020
Y2 - 6 April 2020 through 10 April 2020
ER -