Ion-mediated hopping electrode polarization model for impedance spectra of CH3NH3PbI3
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Ion-mediated hopping electrode polarization model for impedance spectra of CH3NH3PbI3Autoria
Data de publicació
2020-08-18Editor
American Institute of PhysicsISSN
0021-8979Cita bibliogràfica
ALMORA, Osbel, et al. Ion-mediated hopping electrode polarization model for impedance spectra of CH3NH3PbI3. Journal of Applied Physics, 2020, vol. 128, no 7, p. 075104.Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
https://aip.scitation.org/doi/full/10.1063/5.0020554Versió
info:eu-repo/semantics/publishedVersionResum
Methylammonium lead iodide (CH3NH3PbI3) is one of the most attractive materials for optoelectronic applications, and it is the most typical absorber in perovskite solar cells, which are unprecedentedly successful ... [+]
Methylammonium lead iodide (CH3NH3PbI3) is one of the most attractive materials for optoelectronic applications, and it is the most typical absorber in perovskite solar cells, which are unprecedentedly successful devices in terms of power conversion efficiency. In this work, the conductivity and capacitance spectra of symmetrically contacted Au/CH3NH3PbI3/Au thick pellets are measured via impedance spectroscopy at different temperatures in dark equilibrium. The experimental conductivity spectra are parameterized and showed to follow the formalism of hopping DC conductivity in the CH3NH3PbI3 bulk. The presence of several regimes for the general Jonscher's “universal” conductivity–frequency response is highlighted and associated with the ionic–electronic overlapping conductivities. For the capacitance spectra, the general features of electrode polarization capacitance at the CH3NH3PbI3/Au interfaces are identified but yet are found to be in disagreement with some trends of classical ionic conductivity models, unable to separate different contributions. Accordingly, an analytical model is proposed accounting for hopping processes where the low frequency activation energy is split into ionic and electronic components. Our parameterizations and analytical model discern between the bulk/interface and ionic/electronic phenomena and estimate the multiple activation energies in this hybrid halide perovskite. [-]
Publicat a
Journal of Applied Physics 128, 075104 (2020)Proyecto de investigación
VDI/VD Innovation+Technik GmbH (Project-title: PV-ZUM); Ministerio de Ciencia e Innovación (Spain) under Project No. PID2019-107348GB-100; SFB 953 (DFG, Project No. 182849149)Drets d'accés
Published under license by AIP Publishing
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/openAccess
http://rightsstatements.org/vocab/InC/1.0/
info:eu-repo/semantics/openAccess
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