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

被引：0

作者：

Mathew, Preethi Susan ^{[1
,2
,3
]}

Szabó, Gábor ^{[1
,2
,3
]}

Kuno, Masaru ^{[1
,2
,3
]}

Kamat, Prashant V. ^{[1
,2
,3
]}

机构：

[1] Radiation Laboratory, University of Notre Dame, Notre Dame,IN,46556, United States

[2] Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame,IN,46556, United States

[3] Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame,IN,46556, United States

来源：

ACS Energy Letters | 2022年 / 7卷 / 11期

关键词：

Absorption and emissions - Absorption changes - Emission change - Film composition - Halide perovskites - Perovskite films - Phase segregations - Ruddlesden-Popper - Two-dimensional - Visible light;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

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 (BA2Pb2Br4and 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. © 2022 American Chemical Society. All rights reserved.

引用

页码：3982 / 3988