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Lookup NU author(s): Dr Aleksey KozikovORCiD, Vaibhav Verma, Dr Nathan Hill, Dumitru Sirbu, Dr Elisabetta Arca, Professor Noel HealyORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024 The Author(s). Small Structures published by Wiley-VCH GmbH.Surface treatment of perovskite materials with their layered counterparts has become an ubiquitous strategy for maximizing device performance. While layered materials confer great benefits to the longevity and long-term efficiency of the resulting device stack via passivation of defects and surface traps, numerous reports have previously demonstrated that these materials evolve under exposure to light and humidity, suggesting that they are not fully stable. Therefore, it is crucial to study the behavior of these materials in isolation and in conditions mimicking a device stack. Here, it is shown that perovskite capping layers templated by a range of cations on top of methylammonium lead iodide devolve in conditions commonly found during perovskite fabrication, such as exposure to light, solvent, and moisture. Photophysical, structural, and morphological studies are used to show that the degradation of these layered perovskites occurs via a self-limiting, pinhole-mediated mechanism. This results in the loss of whole perovskite sheets, from a few monolayers to tens of nanometers of material, until the system stabilizes again as demonstrated for exfoliated flakes of PEA2PbI4. This means that initially targeted structures may have devolved, with clear optimization implications for device fabrication.
Author(s): Giza M, Kozikov A, Lalaguna PL, Hutchinson JD, Verma V, Vella B, Kumar R, Hill N, Sirbu D, Arca E, Healy N, Milot RL, Kadodwala M, Docampo P
Publication type: Article
Publication status: Published
Journal: Small Structures
Year: 2024
Pages: epub ahead of print
Online publication date: 09/09/2024
Acceptance date: 02/04/2018
Date deposited: 17/09/2024
ISSN (print): 2688-4062
ISSN (electronic): 2688-4062
Publisher: John Wiley and Sons Inc
URL: https://doi.org/10.1002/sstr.202400234
DOI: 10.1002/sstr.202400234
Data Access Statement: The data that support the findings of this study are available from the corresponding author upon reasonable request.
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