Perovskite Solar Cell Modeling Using Light- and Voltage-Modulated Techniques
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https://doi.org/10.1021/acs.jpcc.9b01187 |
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Título
Perovskite Solar Cell Modeling Using Light- and Voltage-Modulated TechniquesAutoría
Fecha de publicación
2019-02-27Editor
American Chemical SocietyCita bibliográfica
RAVISHANKAR, Sandheep, et al. Perovskite Solar Cell Modeling Using Light-and Voltage-Modulated Techniques. The Journal of Physical Chemistry C, 2019, 123.11: 6444-6449.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://pubs.acs.org/doi/abs/10.1021/acs.jpcc.9b01187Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
The analysis of the impedance spectroscopy (IS) data of perovskite solar cells (PSCs) has been challenging so far, with the low-frequency phenomena in particular yielding ambivalent results and interpretations. We ... [+]
The analysis of the impedance spectroscopy (IS) data of perovskite solar cells (PSCs) has been challenging so far, with the low-frequency phenomena in particular yielding ambivalent results and interpretations. We tackle this problem by carrying out intensity-modulated photocurrent spectroscopy (IMPS) measurements at open-circuit (OC) conditions on CH3NH3PbBr3 cells prepared by the flash infrared annealing method with different electron-selective contacts. We identify the existence of a capacitance of the order 10–4 F·cm–2 that is not discernible from IS measurements, which is attributed to the accumulation of anions at the perovskite/spiro-OMeTAD interface, which also likely includes an electronic component. This interface is a dominant recombination pathway at lower voltages and can account for the large disparity in fill factors observed in PSCs. By developing detailed models for the IMPS response at both OC and short-circuit conditions, we also confirm that the arcs observed in the upper quadrant of the IMPS spectra are not related to transport times, as is commonly interpreted, but time constants results from the combination of the series resistance and capacitors within the circuit. By combining the insights from IMPS and IS measurements, we develop a more complete equivalent circuit for PSCs that can be used as a basis for further research with different perovskite materials and contact layers. [-]
Proyecto de investigación
MINECO of Spain (MAT2016-76892-C3-1-R) ; Universitat Jaume I (UJI-B2017-32).Derechos de acceso
Copyright © 2019 American Chemical Society
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