Photoinduced iodide repulsion and halides-demixing in layered perovskites

Liu, Yongtao; Wang, Miaosheng; Ievlev, Anton V.; Ahmadi, Arya; Keum, Jong K.; Ahmadi, Mahshid; Hu, Bin; Ovchinnikova, Olga S.

doi:10.1016/j.mtnano.2022.100197

Photoinduced iodide repulsion and halides-demixing in layered perovskites

Journal Article · Tue Apr 05 00:00:00 EDT 2022 · Materials Today Nano

DOI:https://doi.org/10.1016/j.mtnano.2022.100197· OSTI ID:1884012

^[1]; Wang, Miaosheng ^[2]; ^[3]; Ahmadi, Arya ^[2]; Keum, Jong K. ^[3]; Ahmadi, Mahshid ^[2]; Hu, Bin ^[2]; ^[3]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Mixing halides in metal halide perovskites (MHPs) is an effective approach for adjusting the MHPs bandgap for applications in tandem solar cells. However, mixed-halide (MH-) MHPs undergo light-induced phase segregation (LIPS) under continuous illumination. Therefore, understanding the mechanism of LIPS is necessary for developing stable MH-MHPs. Here, we investigated LIPS in layered (L) MHPs and discovered a critical role of spacer cations in LIPS. Through probing chemical changes of LIPS, we unveil light-induced iodide repulsion and the formation of Br-rich-phase in illuminated regions during LIPS. This discovery also gives insight into the LIPS process in three-dimensional (3D) MHPs. By further investigating LIPS in 3D MHPs, we reveal that LIPS induces not only the formation of Br-rich and I-rich domains but also an overall change of halide distribution along the film thickness direction. Furthermore, LIPS is more significant in bulk due to a larger population of photogenerated charge carriers. Overall, this study reveals the chemical mechanism of LIPS in MHPs and its potential effect on device performance, offering insight into understanding the LIPS mechanism and improving the stability of MHPs.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1884012

Journal Information:: Materials Today Nano, Journal Name: Materials Today Nano Vol. 18; ISSN 2588-8420

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Photoinduced iodide repulsion and halides-demixing in layered perovskites

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