Operation Mechanism of Perovskite Quantum Dot Solar Cells Probed by Impedance Spectroscopy
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Other documents of the author: 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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comunitat-uji-handle2:10234/160292
comunitat-uji-handle3:10234/160293
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Title
Operation Mechanism of Perovskite Quantum Dot Solar Cells Probed by Impedance SpectroscopyAuthor (s)
Date
2018Publisher
American Chemical SocietyISSN
2380-8195Bibliographic citation
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. 251-258Type
info:eu-repo/semantics/articlePublisher version
https://pubs.acs.org/doi/abs/10.1021/acsenergylett.8b02157Version
info:eu-repo/semantics/acceptedVersionSubject
Abstract
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 1Investigation project
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 OfficeRights
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