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Unraveling the rapid ion migration in perovskite solar cells by circuit-switched transient photoelectric technique.

Authors :
Wu, Ziyou
Yuan, Shuai
Miao, Shaoshuai
Li, Yiyi
Zhang, Wenqi
Cao, Dandan
Nie, Junyu
Wang, Yi
Ai, Xi-Cheng
Zhang, Jian-Ping
Source :
Journal of Chemical Physics; 3/21/2024, Vol. 160 Issue 11, p1-5, 5p
Publication Year :
2024

Abstract

Ion migration activated by illumination is a critical factor responsible for the performance decline and stability degradation of perovskite solar cells (PSCs). While ion migration has been widely believed to be much slower than charge transport, recent research suggests that, despite the lack of understanding of the mechanism, it may also be involved in a series of rapid photoelectric responses of PSCs. Here, we report an improved circuit-switched transient photoelectric technique with nanosecond temporal resolution, which enables quantitative characterization of ion migration dynamics in PSCs across a fairly broad time window. Specifically, ion migration occurring within microseconds after illumination (corresponding to a diffusion length of ∼10<superscript>−7</superscript> cm) is unambiguously identified. In conjunction with the composition engineering protocol, we justify that it arises from the short-range migration of halide anions and organic cations around the contact/perovskite interface. The rapid ion migration kinetics revealed in this work strongly complement the well-established ion migration model, which offers new insights into the mechanism of ion-carrier interaction in PSC devices. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00219606
Volume :
160
Issue :
11
Database :
Complementary Index
Journal :
Journal of Chemical Physics
Publication Type :
Academic Journal
Accession number :
176229896
Full Text :
https://doi.org/10.1063/5.0198438