Effect of Environmental Humidity on the Electrical Properties of Lead Halide Perovskites
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Other documents of the author: García-Fernández, Alberto; Moradi, Zahra; Bermúdez-García, Juan Manuel; Sánchez Andújar, Manuel; Gimeno Alfonso, Valero; Castro-García, Socorro; Señarís-Rodríguez, M. A.; Mas, Elena; Garcia-Belmonte, Germà; Fabregat-Santiago, Francisco
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Show full item recordcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/160292
comunitat-uji-handle3:10234/160293
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https://doi.org/10.1021/acs.jpcc.8b03915 |
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Title
Effect of Environmental Humidity on the Electrical Properties of Lead Halide PerovskitesAuthor (s)
Date
2018-12Publisher
ACSBibliographic citation
GARCÍA-FERNÁNDEZ, Alberto, et al. Effect of Environmental Humidity on the Electrical Properties of Lead Halide Perovskites. The Journal of Physical Chemistry C, 2018, 123.4: 2011-2018.Type
info:eu-repo/semantics/articlePublisher version
https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.8b03915Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
In large quantities, water is detrimental to lead halide perovskite solar cells, mainly because of the decomposition of the perovskite layer. In contrast, the presence of small quantities of water has been observed ... [+]
In large quantities, water is detrimental to lead halide perovskite solar cells, mainly because of the decomposition of the perovskite layer. In contrast, the presence of small quantities of water has been observed to play a key role in the crystallization of the perovskite and in the performance of the corresponding devices. However, the exact role of water during the operation of perovskite solar cells is still under debate. In this paper, impedance spectroscopy is used to analyze the changes produced by environmental humidity in the electronic properties of methylammonium lead triiodide perovskite. Our results show that water absorbed from environmental humidity induces a huge increase in the capacitance of this material. This capacitance can reach values as large as the accumulation capacitance found in devices based on perovskite, which is responsible for the characteristic large hysteresis observed between forward and reverse J–V curves. In parallel to this outstanding rise of the capacitance, water absorption produces a significant rise of the conductivity, in agreement with previous reports in the literature. An activation energy of 0.52 eV is found for electronic transport, a value in line with the activation energy of ionic transport found in the literature, which suggests ambipolar diffusion as the transport mechanism that links these two phenomena. [-]
Investigation project
Ministerio de Economía y Competitividad (MINECO) from Spain (Project MAT2013-47192-C3-1-R (NASCENT)) ; EU-FEDER (project ENE2014-56237-C4-4-R) ; Xunta de Galicia (project GRC2014/042)Rights
Copyright © 2018 American Chemical Society
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