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나노물질및화학반응연구단
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In Situ Observation of Photoinduced Halide Segregation in Mixed Halide Perovskite

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Title
In Situ Observation of Photoinduced Halide Segregation in Mixed Halide Perovskite
Author(s)
Hyunhwa Lee; Boonmongkolras, P.; Jun, S.; Kim, D.; Yujin Park; Koh, J.; Cho, Y.-H.; Shin, B.; Jeong Young Park
Publication Date
2023-02
Journal
ACS Applied Energy Materials, v.6, no.3, pp.1565 - 1574
Publisher
American Chemical Society
Abstract
Mixed-halide perovskites have emerged as a promising candidate for optoelectronics, due to their tunable optical properties. However, photoinduced phase segregation remains an obstacle for stable performance in solar cells. Here, we have conducted both bulk and nanoscale measurements to elucidate the mechanism of halide ion migration that leads to phase segregation. By utilizing Kelvin probe force microscopy (KPFM) under illumination, we have observed the time-evolution of ion migration to and from grain boundaries that agreed with bulk photoluminescence spectra of perovskites with a wide range of band gaps (1.67-1.88 eV), Cs0.15FA0.65MA0.20Pb(IxBr1-x)3 where x = 0.47-0.80. By visualizing the changes of band bending at grain boundaries, we deduce that halide segregation is dominantly caused by iodide ions, given faster ion migration in perovskite materials with a higher iodine content. Further, we verify that the changing rate of band bending at grain boundaries is consistent with the emerging rate of I-rich phase at grain boundaries, suggesting the influence of iodide ion migration toward grain boundaries on I-rich phase transition. This work will help provide insight for interpreting the mechanism of light-halide ion interactions. © 2023 American Chemical Society.
URI
https://pr.ibs.re.kr/handle/8788114/13034
DOI
10.1021/acsaem.2c03438
ISSN
2574-0962
Appears in Collections:
Center for Nanomaterials and Chemical Reactions(나노물질 및 화학반응 연구단) > 1. Journal Papers (저널논문)
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