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Article

Tetragonal–Cubic Phase Transition and Low-Field Dielectric Properties of CH3NH3PbI3 Crystals

1
National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania
2
Department of Materials Science and Engineering, University of Connecticut, 97 North Eagleville Road, Storrs, CT 06269, USA
3
Institute of Materials Science, University of Connecticut, 97 North Eagleville Road, Storrs, CT 06269, USA
*
Author to whom correspondence should be addressed.
Academic Editor: E. Andrew Payzant
Materials 2021, 14(15), 4215; https://doi.org/10.3390/ma14154215
Received: 29 June 2021 / Revised: 19 July 2021 / Accepted: 23 July 2021 / Published: 28 July 2021
(This article belongs to the Special Issue Research on Perovskite Materials and Optoelectronic Devices)
The frequency and temperature dependence of dielectric properties of CH3NH3PbI3 (MAPI) crystals have been studied and analyzed in connection with temperature-dependent structural studies. The obtained results bring arguments for the existence of ferroelectricity and aim to complete the current knowledge on the thermally activated conduction mechanisms, in dark equilibrium and in the presence of a small external a.c. electric field. The study correlates the frequency-dispersive dielectric spectra with the conduction mechanisms and their relaxation processes, as well as with the different transport regimes indicated by the Nyquist plots. The different energy barriers revealed by the impedance spectroscopy highlight the dominant transport mechanisms in different frequency and temperature ranges, being associated with the bulk of the grains, their boundaries, and/or the electrodes’ interfaces. View Full-Text
Keywords: MAPI; ferroelectricity; phase transition; conductivity; relaxation processes MAPI; ferroelectricity; phase transition; conductivity; relaxation processes
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MDPI and ACS Style

Patru, R.E.; Khassaf, H.; Pasuk, I.; Botea, M.; Trupina, L.; Ganea, C.-P.; Pintilie, L.; Pintilie, I. Tetragonal–Cubic Phase Transition and Low-Field Dielectric Properties of CH3NH3PbI3 Crystals. Materials 2021, 14, 4215. https://doi.org/10.3390/ma14154215

AMA Style

Patru RE, Khassaf H, Pasuk I, Botea M, Trupina L, Ganea C-P, Pintilie L, Pintilie I. Tetragonal–Cubic Phase Transition and Low-Field Dielectric Properties of CH3NH3PbI3 Crystals. Materials. 2021; 14(15):4215. https://doi.org/10.3390/ma14154215

Chicago/Turabian Style

Patru, Roxana E., Hamidreza Khassaf, Iuliana Pasuk, Mihaela Botea, Lucian Trupina, Constantin-Paul Ganea, Lucian Pintilie, and Ioana Pintilie. 2021. "Tetragonal–Cubic Phase Transition and Low-Field Dielectric Properties of CH3NH3PbI3 Crystals" Materials 14, no. 15: 4215. https://doi.org/10.3390/ma14154215

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