Impedance spectroscopy of perovskite/contact interface: Beneficial chemical reactivity effect
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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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INVESTIGACIONMetadata
Title
Impedance spectroscopy of perovskite/contact interface: Beneficial chemical reactivity effectDate
2019-09-25Publisher
AIP PublishingBibliographic citation
ARANDA, Clara; BISQUERT, Juan; GUERRERO, Antonio. Impedance spectroscopy of perovskite/contact interface: Beneficial chemical reactivity effect. The Journal of Chemical Physics, 2019, 151.12: 124201.Type
info:eu-repo/semantics/articlePublisher version
https://aip.scitation.org/doi/full/10.1063/1.5111925Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
Understanding chemical reactivity of lead halide perovskite materials with contacts is crucial to improve the stability of these optoelectronic devices. The study of the physical and chemical interactions at the ... [+]
Understanding chemical reactivity of lead halide perovskite materials with contacts is crucial to improve the stability of these optoelectronic devices. The study of the physical and chemical interactions at the interfacial region is still one of the most challenging tasks in this field. We investigate a configuration based on the direct contact of gold (Au) with highly crystalline methylammonium lead bromide perovskite (MAPbBr3), in comparison with the presence of an organic interlayer. The metal contact clearly shows the double layer capacitance that can be monitored by Impedance Spectroscopy (IS). Measurements in the dark reveal the frequencies where a reduction in charge accumulation occurs, related to ionic reactivity with the external contacts. Under light, this chemical reaction is favored and the newly formed contact improves the performance of the solar cell. The IS results show that reactivity proceeds at timescales longer than 100 s, reducing the recombination kinetics under 1 sun illumination conditions, increasing the photovoltage and photocurrent that can be extracted. This work presents IS as a nondestructive in operando tool to monitor the kinetics of the ionic double layer formation and the reactivity of methylammonium bromide perovskite material with contacts decoupling as well this information from other resistive and capacitive contributions. [-]
Investigation project
Ministerio de Ciencia, Innovación y Universidades of Spain (Project MAT2016-76892-C3-1-R) ; MICINN, Ramón y Cajal Fellowship (Grant No. RYC-201416809). University Jaume I (Grant No. UJI-B2017-32)Rights
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