Hysteresis in centrosymmetric CuPbI 3 perovskite halide: apolar dielectric or orientable dielectric?

Autor: Bharti PC; Department of Physics, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi-221005 India., Jha PK; Department of Physics, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi-221005 India., Jha PA; Department of Physics, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi-221005 India., Singh P; Department of Physics, Indian Institute of Technology (Banaras Hindu University) Varanasi, Varanasi-221005 India.
Jazyk: angličtina
Zdroj: Journal of physics. Condensed matter : an Institute of Physics journal [J Phys Condens Matter] 2021 Feb 19; Vol. 33 (15). Date of Electronic Publication: 2021 Feb 19.
DOI: 10.1088/1361-648X/abdb67
Abstrakt: We demonstrated the change in polarization behaviour at the surface/interface before and after light through Havriliak-Negami equation of lesser known CuPbI 3 . We have synthesized CuPbI 3 through cold sintering technique and the polarization mechanisms are altered by increasing (cold) sintering temperature. The structure of CuPbI 3 was not known and we predicted it to be hexagonal (R3̄m) with 21R prototype representation. The hysteresis is reported to be affected by ferroelectricity (reorientable dipoles with non-centrosymmetry), to inspect this a centrosymmetric CuPbI 3 is taken. In spite of centrosymmetry, we observed that the hysteresis area and shape of IV curve in AM 1.5 G sunlight shows the drastic variation with the change in polarization behaviour. Our experimental results suggest that apolar dielectric behaviour is the cause of I - V hysteresis rather than robust ferroelectric polarization (which was absent in the present case).
(© 2021 IOP Publishing Ltd.)
Databáze: MEDLINE
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