Direct observation of surface polarization at hybrid perovskite/Au interfaces by dark transient experiments
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Otros documentos de la autoría: Caram, Jorge; García-Batlle, Marisé; Almora Rodríguez, Osbel; Arce, Roberto; Guerrero, Antonio; Garcia-Belmonte, Germà
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Título
Direct observation of surface polarization at hybrid perovskite/Au interfaces by dark transient experimentsAutoría
Fecha de publicación
2020-05-05Editor
American Institute of PhysicsISSN
0003-6951Cita bibliográfica
J. Caram, M. García-Batlle, O. Almora, R. D. Arce, A. Guerrero and G. Garcia-Belmonte. "Direct observation of surface polarization at hybrid perovskite/Au interfaces by dark transient experiments". Appl. Phys. Lett. 116, 183503 (2020); https://doi.org/10.1063/5.0006409Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://aip.scitation.org/doi/full/10.1063/5.0006409Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
A distinctive feature of hybrid perovskite light-absorbing materials is the non-negligible ionic conductivity influencing photovoltaic performance
and stability. Moving ions or vacancies can naturally accumulate at ... [+]
A distinctive feature of hybrid perovskite light-absorbing materials is the non-negligible ionic conductivity influencing photovoltaic performance
and stability. Moving ions or vacancies can naturally accumulate at the outer interfaces (electrode polarization) upon biasing. Contrary to that
approach, a modulation of conductive or recombination properties could manifest as an alteration in the low-frequency part of the impedance
response, either producing inductive or large capacitive features. Under this last view, capacitances are not the response of polarized structures
or charging mechanisms, but result from the modulation of currents. This work intends to provide pieces of evidence that assist us in distin-
guishing between these two dissimilar mechanisms, namely, real charge polarization and delayed current effects under bias in the dark. The
analysis relays upon an experimental technique based on transient charging signals using the Sawyer-Tower circuit. Instead of applying an alter-
nating small perturbation over a steady-state voltage (differential capacitance method), transient charging measures the resulting polarization
upon a large bias step under the suppression of dc currents. Our findings reveal that real steady-state charge is indeed induced by the applied
voltage in the dark, easily interpreted by means of charged real capacitors with values much larger than the geometrical capacitance of the film.
The connection between that polarization and the charging of perovskite/contact interfaces is highlighted. [-]
Publicado en
Applied Physics Letters, 2020, vol. 116, no 18Proyecto de investigación
We acknowledge the support from the Horizon 2020 project (Grant No. 871336-PEROXIS). M.G.-B. acknowledges Generalitat Valenciana for Grant No. GRISOLIAP/2018/073. SCIC at UJI are also acknowledged. O.A. acknowledges the financial support from the VDI/VD Innovation þ Technik GmbH (Project-title: PV-ZUM) and the SAOT funded by the German Research Foundation (DFG) in the framework of the German excellence initiative. J.C. acknowledges the partial support by project PUE-054-CONICET, Argentina.Derechos de acceso
© 2020 Author(s)
“This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in CARAM, Jorge, et al. Direct observation of surface polarization at hybrid perovskite/Au interfaces by dark transient experiments. Applied Physics Letters, 2020, vol. 116, no 18, p. 183503 and may be found at https://aip.scitation.org/doi/abs/10.1063/5.0006409"
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