Negative Capacitance and Inverted Hysteresis: Matching Features in Perovskite Solar Cells
Impacto
Scholar |
Otros documentos de la autoría: Alvarez, Agustin; Arcas, Ramón; Aranda Alonso, Clara; Bethencourt, Loengrid; Mas, Elena; Saliba, Michael; Fabregat-Santiago, Francisco
Metadatos
Mostrar el registro completo del ítemcomunitat-uji-handle:10234/9
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INVESTIGACIONMetadatos
Título
Negative Capacitance and Inverted Hysteresis: Matching Features in Perovskite Solar CellsAutoría
Fecha de publicación
2020-10-01Editor
American Chemical SocietyISSN
1948-7185Cita bibliográfica
ALVAREZ, Agustin O., et al. Negative Capacitance and Inverted Hysteresis: Matching Features in Perovskite Solar Cells. arXiv preprint arXiv:2005.11828, 2020.Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://pubs.acs.org/doi/pdf/10.1021/acs.jpclett.0c02331Versión
info:eu-repo/semantics/acceptedVersionPalabras clave / Materias
Resumen
Negative capacitance in the low-frequency domain and inverted hysteresis are familiar features in perovskite solar cells, which origin is still under discussion. Here we use impedance spectroscopy to analyze these ... [+]
Negative capacitance in the low-frequency domain and inverted hysteresis are familiar features in perovskite solar cells, which origin is still under discussion. Here we use impedance spectroscopy to analyze these responses in methylammonium lead bromide cells treated with lithium cations at the electron-selective layer/perovskite interface and in iodide devices exposed to different relative humidity conditions. Employing the surface polarization model, we obtain a time constant associated with the kinetics of the interaction of ions/vacancies with the surface, τkin, in the range of 100–102 s for all the cases exhibiting both features. These interactions lead to a decrease in the overall recombination resistance, modifying the low-frequency perovskite response and yielding a flattening of the cyclic voltammetry. As a consequence of these results we find that negative capacitance and inverted hysteresis lead to a decrease in the fill factor and photovoltage values. [-]
Publicado en
J. Phys. Chem. Lett. 2020, 11, 19, 8417–8423Proyecto de investigación
No 764787, ENE2017-85087-C3-1-RDerechos de acceso
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