Dhaifallah R Almalawi, Mohamed Bouzidi, Idris H Smaili, N I Aljuraide, Ali Alzahrani, A Saftah, Mohamed Ben Bechir
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Abstract
In this study, we report the structural, optical, and electrical properties of lead-free CsSnBr3 perovskite synthesized via melt growth. UV-Vis absorption and Tauc plot analysis reveal a direct optical band gap of 1.75 eV. Photoluminescence and time-resolved PL measurements confirm efficient radiative recombination and reveal carrier lifetimes on the nanosecond scale. Impedance spectroscopy and dielectric analysis across 300-400 K show non-Debye relaxation and support a small-polaron hopping conduction mechanism, with activation energies consistent with frequency-dependent conductivity. A unique correlation is established between the optical carrier dynamics and low-frequency electrical behavior. These findings contribute to a deeper understanding of charge transport in CsSnBr3 and support its potential use in lead-free optoelectronic applications such as photodetectors and solar energy conversion.
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