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dc.contributor.authorRavishankar, Sandheep
dc.contributor.authorAranda Alonso, Clara
dc.contributor.authorBoix, Pablo P
dc.contributor.authorAnta, Juan A.
dc.contributor.authorBisquert, Juan
dc.contributor.authorGarcia-Belmonte, Germà
dc.date.accessioned2018-12-21T08:41:28Z
dc.date.available2018-12-21T08:41:28Z
dc.date.issued2018-05
dc.identifier.citationRAVISHANKAR, Sandheep, et al. Effects of Frequency Dependence of the External Quantum Efficiency of Perovskite Solar Cells. The journal of physical chemistry letters, 2018.ca_CA
dc.identifier.urihttp://hdl.handle.net/10234/178342
dc.description.abstractPerovskite 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.ca_CA
dc.format.extent5 p.ca_CA
dc.format.mimetypeapplication/pdfca_CA
dc.language.isoengca_CA
dc.publisherAmerican Chemical Societyca_CA
dc.rightsCopyright © 2018 American Chemical Societyca_CA
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/*
dc.subjectperovskite solar cellsca_CA
dc.subjectefficiencyca_CA
dc.subjectmetal drawingca_CA
dc.subjectperovskiteca_CA
dc.subjectquantum theoryca_CA
dc.subjectsolar cellsca_CA
dc.titleEffects of Frequency Dependence of the External Quantum Efficiency of Perovskite Solar Cellsca_CA
dc.typeinfo:eu-repo/semantics/articleca_CA
dc.identifier.doihttp://dx.doi.org/10.1021/acs.jpclett.8b01245
dc.rights.accessRightsinfo:eu-repo/semantics/openAccessca_CA
dc.relation.publisherVersionhttps://pubs.acs.org/doi/abs/10.1021/acs.jpclett.8b01245ca_CA
dc.type.versioninfo:eu-repo/semantics/submittedVersionca_CA


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Mostra el registre parcial de l'element