We report studies on the unusual frequency dispersion of the dielectric permittivity maxima of methylammonium lead iodide pellets at temperatures around the tetragonal–cubic phase transition. The origin of this observed permittivity response was studied in terms of grains and grain boundaries’ contributions in impedance, electric modulus, dielectric permittivity, and electrical conductivity. From theoretical fits of impedance and electric modulus measurements at different temperatures over a frequency range of 103–10 Hz, the reconstructed contributions of the grain boundary and grain permittivities show peaks around 339 K and 384 K, respectively. The origin of the grain boundary permittivity peak is discussed in terms of heterogenic ionic conduction associated with I− and MA+ ions in MAPbI3, while the peak in grain permittivity at high temperature is in terms of ionization of intrinsic carriers. The high value of the grain dielectric permittivity , compared to the reconstructed grain boundary permittivity , suggests a possible relaxor ferroelectric behavior with a diffuse phase transition for methylammonium lead iodide. The difficulties in confirming the ferroelectric nature of this halide perovskite based on impedance and electrical module data are also discussed.
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An unusual frequency dispersion of the dielectric permittivity maxima at temperatures around the tetragonal–cubic phase transition of methylammonium lead iodide
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28 June 2020
Research Article|
June 26 2020
An unusual frequency dispersion of the dielectric permittivity maxima at temperatures around the tetragonal–cubic phase transition of methylammonium lead iodide
Special Collection:
Hybrid Organic-Inorganic Halide Perovskites
F. B. Minussi
;
F. B. Minussi
1
Department of Physics and Chemistry, São Paulo State University
, 15385-000 Ilha Solteira, Brazil
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S. P. Reis
;
S. P. Reis
1
Department of Physics and Chemistry, São Paulo State University
, 15385-000 Ilha Solteira, Brazil
2
Federal Institute of Education, Science and Technology of São Paulo
, 15503-110 Votuporanga, Brazil
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E. B. Araújo
E. B. Araújo
a)
1
Department of Physics and Chemistry, São Paulo State University
, 15385-000 Ilha Solteira, Brazil
a)Author to whom correspondence should be addressed: eudes.borges@unesp.br
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a)Author to whom correspondence should be addressed: eudes.borges@unesp.br
Note: This paper is part of the special collection on Hybrid Organic-Inorganic Halide Perovskites
J. Appl. Phys. 127, 244103 (2020)
Article history
Received:
April 30 2020
Accepted:
June 14 2020
Citation
F. B. Minussi, S. P. Reis, E. B. Araújo; An unusual frequency dispersion of the dielectric permittivity maxima at temperatures around the tetragonal–cubic phase transition of methylammonium lead iodide. J. Appl. Phys. 28 June 2020; 127 (24): 244103. https://doi.org/10.1063/5.0012428
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