Revealing the Dynamic Aspects of Photoinduced Halide Segregation in Mixed-Halide Cs 0.15 FA 0.85 PbI 2 Br Perovskite Films Using a Hyperspectral Imaging Technique

The band gap energy of halide perovskite semiconductors is manipulated by controlling the halide composition, and mixed halide perovskites are receiving much attention as top cell materials for tandem solar cells. To understand dynamic aspects of photoinduced halide segregation in mixed-halide perov...

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Published in:The journal of physical chemistry letters 2024-12, Vol.15 (50), p.12341-12347
Main Authors: Daikoku, Yusuke, Yamada, Takumi, Shimazaki, Ai, Nakamura, Tomoya, Wakamiya, Atsushi, Kanemitsu, Yoshihiko
Format: Article
Language:English
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Summary:The band gap energy of halide perovskite semiconductors is manipulated by controlling the halide composition, and mixed halide perovskites are receiving much attention as top cell materials for tandem solar cells. To understand dynamic aspects of photoinduced halide segregation in mixed-halide perovskite films, we use a hyperspectral imaging technique. We reveal the space- and time-resolved photoluminescence (PL) spectra of Cs FA PbI Br perovskite films during prolonged light illumination. Under applied electric fields, we observe photoinduced phase segregation at the excitation laser spot, with a line-shape I-rich region of low PL efficiency appearing near the anode electrode. This I-rich region moves from the anode to the cathode electrodes and stops at the laser excitation spot. We discuss the significant enhancement of halide ion migration under light illumination and the dynamical changes of photoinduced halide segregation.
ISSN:1948-7185
1948-7185
DOI:10.1021/acs.jpclett.4c03077