Photovoltage Behavior in Perovskite Solar Cells under Light-Soaking Showing Photoinduced Interfacial Changes
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Other documents of the author: Hu, Jiangang; Gottesman, Ronen; Gouda, Laxman; Kama, Adi; Priel, Maayan; Shay, Tirosh; Bisquert, Juan; Zaban, Arie
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http://dx.doi.org/10.1021/acsenergylett.7b00212 |
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Title
Photovoltage Behavior in Perovskite Solar Cells under Light-Soaking Showing Photoinduced Interfacial ChangesAuthor (s)
Date
2017Publisher
American Chemical SocietyISSN
2380-8195Bibliographic citation
HU, Jiangang, et al. Photovoltage Behavior in Perovskite Solar Cells under Light-Soaking Showing Photoinduced Interfacial Changes. ACS Energy Letters, 2017, vol. 2, no 5, p. 950-956.Type
info:eu-repo/semantics/articlePublisher version
http://pubs.acs.org/doi/abs/10.1021/acsenergylett.7b00212Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
The photovoltage of perovskite solar cells (PSCs) was studied over a wide range of light intensities, showing changes from pristine to light-soaking (LS) conditions, explained using a specific model of spatial charge ... [+]
The photovoltage of perovskite solar cells (PSCs) was studied over a wide range of light intensities, showing changes from pristine to light-soaking (LS) conditions, explained using a specific model of spatial charge distribution. Migration of ions and vacancies under photovoltage conditions results in localized charge redistribution manifested as positive charge accumulation at the TiO2 or TiO2–MgO interlayer–perovskite interface, signifying photoinduced interfacial upward band bending. Consequentially, generation of an electrostatic potential (Velec) and an increase in interfacial recombination rate are confirmed. The magnitude and effect of Velec and interfacial recombination on the photovoltage depend on the illumination intensity and on the LS duration. PSCs with mesoporous Al2O3 showed similar changes, validating the role of the compact TiO2. Faster generation and a gradual increase of Velec are apparent under LS, which expresses the constant migration of ions and vacancies toward the interface. The nonrigid TiO2–perovskite interface calls for a vital perspective change of PSCs. [-]
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ACS Energy Letters, 2017, vol. 2, no 5, p. 950-956Investigation project
European Union Seventh Framework Program [FP7] / 316494; MINECO / MAT2016-76892-C3-1-R; Generalitat Valenciana / PROMETEO II/2014/020Rights
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