Capacitive dark currents, hysteresis, and electrode polarization in lead halide perovskite solar cells
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Other documents of the author: Almora Rodríguez, Osbel; Zarazúa, Isaac; Mas, Elena; Mora-Sero, Ivan; Bisquert, Juan; Garcia-Belmonte, Germà
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comunitat-uji-handle2:10234/2507
comunitat-uji-handle3:10234/6973
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http://dx.doi.org/10.1021/acs.jpclett.5b00480 |
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Title
Capacitive dark currents, hysteresis, and electrode polarization in lead halide perovskite solar cellsAuthor (s)
Date
2015-04Publisher
American Chemical SocietyBibliographic citation
ALMORA, Osbel, et al. Capacitive dark currents, hysteresis, and electrode polarization in lead halide perovskite solar cells. The journal of physical chemistry letters, 2015, vol. 6, no 9, p. 1645-1652.Type
info:eu-repo/semantics/articlePublisher version
http://pubs.acs.org/doi/abs/10.1021/acs.jpclett.5b00480Version
info:eu-repo/semantics/publishedVersionSubject
Abstract
Despite spectacular advances in conversion efficiency of perovskite solar cell many aspects of its operating modes are still poorly understood. Capacitance constitutes a key parameter to explore which mechanisms control ... [+]
Despite spectacular advances in conversion efficiency of perovskite solar cell many aspects of its operating modes are still poorly understood. Capacitance constitutes a key parameter to explore which mechanisms control particular functioning and undesired effects as current hysteresis. Analyzing capacitive responses allows addressing not only the nature of charge distribution in the device but also the kinetics of the charging processes and how they alter the solar cell current. Two main polarization processes are identified. Dielectric properties of the microscopic dipolar units through the orthorhombic-to-tetragonal phase transition account for the measured intermediate frequency capacitance. Electrode polarization caused by interfacial effects, presumably related to kinetically slow ions piled up in the vicinity of the outer interfaces, consistently explain the reported excess capacitance values at low frequencies. In addition, current–voltage curves and capacitive responses of perovskite-based solar cells are connected. The observed hysteretic effect in the dark current originates from the slow capacitive mechanisms. [-]
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J. Phys. Chem. Lett., 2015, 6 (9)Rights
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