Dielectric behaviour of mechano-chemically synthesised [(CH₃NH₃)₃Bi₂Br₉]: a lead free hybrid perovskite

ABSTRACT

Lead-free hybrid halide perovskite (CH₃NH₃)₃Bi₂Br₉ has been successfully synthesised by mechano-chemical method. The microstructure analysis by Rietveld’s refinement method revealed that the crystal belongs to trigonal system with space group P$\bar{3}$m1. The obtained microstructural parameters are well in agreement with the previously published data. Temperature-dependent AC conductivity, impedance spectroscopy and complex dielectric properties have been investigated in detail. The negative temperature coefficient of resistance behaviour reveals the semiconducting nature of the materials. The complex impedance spectroscopy also supports the semiconducting nature of the sample with activation energy for conduction ~0.38 eV.

KEYWORDS:

• Lead-free hybrid perovskite
• dielectric properties
• Rietveld refinement
• impedance spectroscopy

Acknowledgements

Sachindranath Das is thankful to Department of Science and Technology and Bio-Technology, Government of West Bengal [247(Sanc.)/ST/P/S&T/16G-36/2017 dated 25/03/2018] for research funding.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Department of Science and Technology and Bio- Technology, Government of West Bengal [247(Sanc.)/ST/P/S&T/16G-36/2017].