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

被引：11

作者：

Patru, Roxana E. ^{[1
]}

Khassaf, Hamidreza ^{[2
,3
]}

Pasuk, Iuliana ^{[1
]}

Botea, Mihaela ^{[1
]}

Trupina, Lucian ^{[1
]}

Ganea, Constantin-Paul ^{[1
]}

Pintilie, Lucian ^{[1
]}

Pintilie, Ioana ^{[1
]}

机构：

[1] Natl Inst Mat Phys, Atomistilor 405A, Magurele 077125, Romania

[2] Univ Connecticut, Dept Mat Sci & Engn, 97 North Eagleville Rd, Storrs, CT 06269 USA

[3] Univ Connecticut, Inst Mat Sci, 97 North Eagleville Rd, Storrs, CT 06269 USA

来源：

MATERIALS | 2021年 / 14卷 / 15期

关键词：

MAPI; ferroelectricity; phase transition; conductivity; relaxation processes; METHYLAMMONIUM LEAD IODIDE; PEROVSKITE SOLAR-CELLS; ION MIGRATION; IMPEDANCE; POLARIZATION; DIFFUSION; TRANSPORT; CONSTANT; HYSTERESIS; RELAXATION;

D O I：

10.3390/ma14154215

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页数：24

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