Operation Mechanism of Perovskite Quantum Dot Solar Cells Probed by Impedance Spectroscopy
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Otros documentos de la autoría: Zolfaghari, Zahra; Hassanabadi, Ehsan; Pitarch-Tena, Didac; YOON, SEOG JOON; Shariatinia, Zahra; van de Lagemaat, Jao; Luther, Joseph M.; Mora-Sero, Ivan
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INVESTIGACIONMetadatos
Título
Operation Mechanism of Perovskite Quantum Dot Solar Cells Probed by Impedance SpectroscopyAutoría
Fecha de publicación
2018Editor
American Chemical SocietyISSN
2380-8195Cita bibliográfica
ZOLFAGHARI, Zahra, et al. Operation Mechanism of Perovskite Quantum Dot Solar Cells Probed by Impedance Spectroscopy. ACS Energy Letters, 2019, vol. 4, no 1, p. 251-258Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://pubs.acs.org/doi/abs/10.1021/acsenergylett.8b02157Versión
info:eu-repo/semantics/acceptedVersionPalabras clave / Materias
Resumen
We fabricated perovskite quantum dot solar cells (PQDSCs) and varied the thickness of the QD layer by controlling the number of deposition cycles; the cells were systematically investigated with impedance spectroscopy. ... [+]
We fabricated perovskite quantum dot solar cells (PQDSCs) and varied the thickness of the QD layer by controlling the number of deposition cycles; the cells were systematically investigated with impedance spectroscopy. Despite the evident structural differences with respect to standard perovskite solar cells (PSCs), similar impedance spectra were obtained for PQDSCs, pointing to similar working principles in terms of the active layer. We distinguish two different regimes: At low illumination, recombination is ruled by multiple trapping with trap distributions and/or shunting. However, at higher light intensities, Shockley–Read–Hall recombination is observed. In addition, the low-frequency capacitance, CLF, of PQDSCs increases several orders of magnitude when the illumination is varied from dark to 1-sun conditions. This feature has not been observed in other kinds of photovoltaic devices and is characteristic of PSCs. Although there is no consensus about the exact mechanism responsible for CLF, the suggested models point to an ion migration origin. Its observation in thin-film and PQDSCs devices implies a similar effect in both. [-]
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ACS Energy Letters, 2019, vol. 4, no 1Proyecto de investigación
European Research Council (ERC): 724424 -No-LIMIT; Generalitat Valenciana via Prometeo Grant Q-Devices: Prometeo/2018/098; U.S. Department of Energy (DOE): DE-AC36-08GO28308; U.S. Department of Energy Office of Energy Efficiency and Renewable Energy Solar Energy Technologies OfficeDerechos de acceso
Copyright © American Chemical Society
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