Stability of Cesium-Based Lead Halide Perovskites under UV Radiation.

Autor: Qin Z; Department of Material Science and Engineering, The University of Texas at Dallas, 2601 North Floyd Road RL10, Richardson, Texas 75080, United States., Caraveo-Frescas JA; Department of Material Science and Engineering, The University of Texas at Dallas, 2601 North Floyd Road RL10, Richardson, Texas 75080, United States., Fernandez-Izquierdo L; Department of Material Science and Engineering, The University of Texas at Dallas, 2601 North Floyd Road RL10, Richardson, Texas 75080, United States., Arellano-Jimenez MJ; Department of Material Science and Engineering, The University of Texas at Dallas, 2601 North Floyd Road RL10, Richardson, Texas 75080, United States., Aguirre-Tostado FS; Department of Material Science and Engineering, The University of Texas at Dallas, 2601 North Floyd Road RL10, Richardson, Texas 75080, United States.; Centro de Investigacion en Materiales Avanzados, SC Alianza Norte 202, Apodaca, NL 66628, Mexico., Reyes-Banda MG; Department of Material Science and Engineering, The University of Texas at Dallas, 2601 North Floyd Road RL10, Richardson, Texas 75080, United States., Quevedo-Lopez MA; Department of Material Science and Engineering, The University of Texas at Dallas, 2601 North Floyd Road RL10, Richardson, Texas 75080, United States.
Jazyk: angličtina
Zdroj: ACS omega [ACS Omega] 2024 Jun 03; Vol. 9 (24), pp. 26683-26691. Date of Electronic Publication: 2024 Jun 03 (Print Publication: 2024).
DOI: 10.1021/acsomega.4c01461
Abstrakt: Lead halide perovskites have been extensively studied for their potential applications, including photodetectors, solar cells, and high-energy radiation detection. These applications are possible because of their unique optoelectronic properties, such as tunable band gap, high optical absorption coefficient, and unique defect self-healing properties, which result in high defect tolerance. Despite these advantages, the long-term stability remains a critical issue that could hinder commercial applications of these materials. Reports on the stability of lead halide perovskites for optoelectronic applications have normally focused on methylammonium (MA)/formamidinium (FA), with very limited information for other systems, in particular, Cs-containing perovskites. In this paper, we report the stability of thick CsPbBr 3- x Cl x polycrystalline thin films (∼8 μm) with several halide Br-Cl ratios after exposure to deep UV radiation. The chemical, crystal structure, optical, and electrical properties are analyzed, and the results are used to propose a degradation mechanism. The chemical analysis on the surface and bulk of the films indicates the formation of cesium oxide after UV exposure, with no significant change in the crystalline structure. The proposed mechanism explains the formation of cesium oxides during UV exposure. The I - V characteristics of diode structures also showed significant degradation after UV exposure, primarily at lower diode rectification ratios. The mechanism proposed in this paper can contribute to developing strategies to enhance the long-term stability of inorganic lead halide perovskites under UV exposure.
Competing Interests: The authors declare no competing financial interest.
(© 2024 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
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