Effects of Frequency Dependence of the External Quantum Efficiency of Perovskite Solar Cells
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Effects of Frequency Dependence of the External Quantum Efficiency of Perovskite Solar CellsAutoria
Data de publicació
2018-05Editor
American Chemical SocietyCita bibliogràfica
RAVISHANKAR, Sandheep, et al. Effects of Frequency Dependence of the External Quantum Efficiency of Perovskite Solar Cells. The journal of physical chemistry letters, 2018.Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://pubs.acs.org/doi/abs/10.1021/acs.jpclett.8b01245Versió
info:eu-repo/semantics/submittedVersionParaules clau / Matèries
Resum
Perovskite solar cells are known to show very long response time scales, on the order of milliseconds to seconds. This generates considerable doubt over the validity of the measured external quantum efficiency (EQE) ... [+]
Perovskite solar cells are known to show very long response time scales, on the order of milliseconds to seconds. This generates considerable doubt over the validity of the measured external quantum efficiency (EQE) and consequently the estimation of the short-circuit current density. We observe a variation as high as 10% in the values of the EQE of perovskite solar cells for different optical chopper frequencies between 10 and 500 Hz, indicating a need to establish well-defined protocols of EQE measurement. We also corroborate these values and obtain new insights regarding the working mechanisms of perovskite solar cells from intensity-modulated photocurrent spectroscopy measurements, identifying the evolution of the EQE over a range of frequencies, displaying a singular reduction at very low frequencies. This reduction in EQE is ascribed to additional resistive contributions hindering charge extraction in the perovskite solar cell at short-circuit conditions, which are delayed because of the concomitant large low-frequency capacitance. [-]
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