Overcoming ionic migration in perovskite solar cells through alkali metals
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Other documents of the author: Aranda Alonso, Clara; Alvarez, Agustin; Chivrony, Vladimir S.; Das, Chittaranjan; Rai, Monika; Saliba, Michael
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comunitat-uji-handle2:10234/160292
comunitat-uji-handle3:10234/160293
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https://doi.org/10.1016/j.joule.2023.11.011 |
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Title
Overcoming ionic migration in perovskite solar cells through alkali metalsAuthor (s)
Date
2024-01-17Publisher
ElsevierISSN
2542-4351Bibliographic citation
Aranda, C. A., Alvarez, A. O., Chivrony, V. S., Das, C., Rai, M., & Saliba, M. (2024). Overcoming ionic migration in perovskite solar cells through alkali metals. Joule, 8(1), 241-254.Type
info:eu-repo/semantics/articleVersion
info:eu-repo/semantics/publishedVersionSubject
Abstract
Alkali metals, as additives in perovskite solar cells (PSCs), have been extensively investigated for their impact on performance enhancement. This performance is sensitive to ion-driven interfacial recombination ... [+]
Alkali metals, as additives in perovskite solar cells (PSCs), have been extensively investigated for their impact on performance enhancement. This performance is sensitive to ion-driven interfacial recombination processes that lead to voltage losses and perform with negative capacitance features in impedance spectroscopy (IS). In this study, we exploited negative capacitance as a tool to systematically investigate the influence of Li, Na, and K on the photovoltage of the wide band-gap material MAPbBr3, known for historical photovoltage losses. Sodium cations were found to mitigate adverse interfacial recombination pathways, yielding a remarkable stabilized open-circuit potential of 1.65 V. Impedance measurements indicated sodium significant influence within the material’s bulk, corroborated by time-of-flight secondary ion mass spectrometry and X-ray photoelectron spectroscopy. These techniques confirmed the ability of Na to decrease ionic migration in perovskite materials. X-ray photoelectron spectroscopy (XPS) revealed the underlying mechanism by which Na accomplishes this task: through an electrostatic interaction with the organic compounds. [-]
Funder Name
German Research Foundation (DFG) | Ministerio de Ciencia, Innovación y Universidades | Centro para el Desarrollo Tecnológico y la Innovación
Project code
SPP2196, GRK 2642 | PCI2020-112185 | IDI-20210171
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© 2023 Published by Elsevier Inc.
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