Exploring the Radiation Damage of Vacancy‐Ordered Double Perovskites, ((NH 4 ) (1− x ) FA x ) 2 SnBr 6

Journal article

Degradation studies of the ASnX3 perovskites to the A2SnX6 vacancy‐ordered double perovskite form have been well researched, but little is known about how A2SnX6 compounds degrade. Herein, a new double perovskite, FA2SnBr6 (FA = CH(NH2)2), is synthesized and characterized by using X‐ray diffraction and X‐ray photoelectron spectroscopy. FA2SnBr6 is found to crystallize in the P21/n monoclinic space group and shows the ability to form single‐phase, solid solutions with another double perovskite (NH4)2SnBr6. Solid solutions of ((NH4)(1−x)FA x )2SnBr6, where x = 0.03, 0.04, 0.06, and 0.09, are produced, and X‐ray radiation damage is investigated to qualitatively and quantitatively uncover degradation mechanisms. Correlation analysis, a new statistical analytical method for X‐ray photoelectron spectra, is used to fortify peak fitting models. Comparing shifts in binding energies and relative atomic quantities between two elements constructs phase models from different spectral environments to understand the degradation of these compounds. In each radiation damage experiment, great consideration must be taken to combine the chemistry of the system and the physical process of photoelectron emission with the quantitative phase models formed. Overall, the presence of ammonium in the double perovskite enhances the stability of the compound to X‐ray irradiation.

Authors: Bhatt, P; Stucky de Quay, T; Liu, Y; Evans, T; McCullough, O

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Wiley
• Journal: ChemPhysChem
• Article number: e202500370
• Publication date: 2025-11-04
• DOI: 10.1002/cphc.202500370
• EISSN: 1439-7641
• ISSN: 1439-4235
• Language: English
• Keywords: correlation analysis; halide perovskites; radiation damage; X‐ray photoelectron spectroscopy