Phase Segregation and Sequential Expulsion of Iodide and Bromide in Photoirradiated Ruddlesden–Popper 2D Perovskite Films

Mathew, Preethi Susan; Szabó, Gábor; Kuno, Masaru; Kamat, Prashant V.

doi:10.1021/acsenergylett.2c02026

Phase Segregation and Sequential Expulsion of Iodide and Bromide in Photoirradiated Ruddlesden–Popper 2D Perovskite Films

Journal Article · Wed Oct 19 00:00:00 EDT 2022 · ACS Energy Letters

DOI:https://doi.org/10.1021/acsenergylett.2c02026· OSTI ID:1909218

^[1]; Szabó, Gábor ^[2]; ^[2]; ^[2]

Univ. of Notre Dame, IN (United States); University of Notre Dame
Univ. of Notre Dame, IN (United States)

Two-dimensional (2D) Ruddlesden–Popper mixed-halide perovskite films, BA₂PbBr₂I₂, undergo phase segregation when excited with visible light to generate bromide- and iodide-rich regions, as marked by absorption and emission changes. Upon stopping illumination, the process reverses, allowing original film compositions to be restored. However, if films are in contact with dichloromethane, light irradiation causes the sequential expulsion of iodide and bromide and introduces irreversible changes to the 2D films. The sequential disappearance of I– and Br– from pristine films (BA₂Pb₂Br₄ and BA₂Pb₂I₄) under photoirradiation, as observed from variances in expulsion rates, reflects differences in halide ion mobilities in these films. The photoinstability of 2D films raises questions about their use in stabilizing bulk, three-dimensional (3D) perovskite solar cells through 3D/2D interfaces.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Notre Dame, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: FC02-04ER15533; SC0014334

OSTI ID:: 1909218

Journal Information:: ACS Energy Letters, Journal Name: ACS Energy Letters Journal Issue: 11 Vol. 7; ISSN 2380-8195

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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