Ion-mediated hopping electrode polarization model for impedance spectra of CH3NH3PbI3

Almora Rodriguez O, González-Lezcano A, Guerrero A, Brabec CJ, Garcia-Belmonte G (2020)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2020

Journal

Journal of Applied Physics AIP Publishing

Book Volume: 128

Article Number: 075104

URI: https://aip.scitation.org/doi/10.1063/5.0020554

DOI: 10.1063/5.0020554

Abstract

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.

Authors with CRIS profile

Osbel Almora Rodriguez Institute Materials for Electronics and Energy Technology (i-MEET) (i-MEET) Christoph Brabec

Additional Organisation(s)

Erlangen Graduate School in Advanced Optical Technologies (SAOT)

Related research project(s)

PV-ZUM - DynaSol/ Transientes photolelektronisches Messverfahren (DynaSolar) May 1, 2017 - July 31, 2020

Involved external institutions

Universitat Jaume I (UJI) ES Spain (ES) Bayerisches Zentrum für Angewandte Energieforschung e.V. (ZAE Bayern) DE Germany (DE)

How to cite

APA:

Almora Rodriguez, O., González-Lezcano, A., Guerrero, A., Brabec, C.J., & Garcia-Belmonte, G. (2020). Ion-mediated hopping electrode polarization model for impedance spectra of CH3NH3PbI3. Journal of Applied Physics, 128. https://doi.org/10.1063/5.0020554

MLA:

Almora Rodriguez, Osbel, et al. "Ion-mediated hopping electrode polarization model for impedance spectra of CH3NH3PbI3." Journal of Applied Physics 128 (2020).

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