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.
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21 August 2020
Research Article|
August 18 2020
Ion-mediated hopping electrode polarization model for impedance spectra of CH3NH3PbI3 Available to Purchase
Osbel Almora
;
Osbel Almora
a)
1
Institute of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-Universität Erlangen-Nürnberg
, 91058 Erlangen, Germany
2
Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg
, 91052 Erlangen, Germany
3
Institute of Advanced Materials (INAM), Universitat Jaume I
, 12006 Castelló, Spain
a)Author to whom correspondence should be addressed: [email protected]
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Alfredo González-Lezcano
;
Alfredo González-Lezcano
4
SISSA International School for Advanced Studies and INFN
, 34136 Trieste, Italy
5
Departamento de Física, Universidad de Pinar del Río
, 20100 Pinar del Río, Cuba
6
The Abdus Salam International Centre for Theoretical Physics
, 34014 Trieste, Italy
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Antonio Guerrero
;
Antonio Guerrero
3
Institute of Advanced Materials (INAM), Universitat Jaume I
, 12006 Castelló, Spain
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Christoph J. Brabec
;
Christoph J. Brabec
1
Institute of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-Universität Erlangen-Nürnberg
, 91058 Erlangen, Germany
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Germà Garcia-Belmonte
Germà Garcia-Belmonte
3
Institute of Advanced Materials (INAM), Universitat Jaume I
, 12006 Castelló, Spain
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Osbel Almora
1,2,3,a)
Alfredo González-Lezcano
4,5,6
Antonio Guerrero
3
Christoph J. Brabec
1
Germà Garcia-Belmonte
3
1
Institute of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-Universität Erlangen-Nürnberg
, 91058 Erlangen, Germany
2
Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg
, 91052 Erlangen, Germany
3
Institute of Advanced Materials (INAM), Universitat Jaume I
, 12006 Castelló, Spain
4
SISSA International School for Advanced Studies and INFN
, 34136 Trieste, Italy
5
Departamento de Física, Universidad de Pinar del Río
, 20100 Pinar del Río, Cuba
6
The Abdus Salam International Centre for Theoretical Physics
, 34014 Trieste, Italy
a)Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 128, 075104 (2020)
Article history
Received:
July 02 2020
Accepted:
July 28 2020
Citation
Osbel Almora, Alfredo González-Lezcano, Antonio Guerrero, Christoph J. Brabec, Germà Garcia-Belmonte; Ion-mediated hopping electrode polarization model for impedance spectra of CH3NH3PbI3. J. Appl. Phys. 21 August 2020; 128 (7): 075104. https://doi.org/10.1063/5.0020554
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