Dielectric Relaxation and Charge Transfer Mechanism of the Inorganic Perovskite CsHgCl3

Inorganic perovskite provides promising opportunities for use in optoelectronics due to its wide range of physical characteristics and structural configuration. In this paper, the CsHgCl3 compound was successfully synthesized via the slow evaporation method at room temperature. The X-ray diffraction pattern indicated a cubic structure in the 𝑃𝑚3̅𝑚 group space. Also, an extensive investigation was performed into the relative permittivity and "ac" conductivity within the 10–106 Hz frequency range at different temperatures. Electrical and dielectric studies reveal that the studied material undergoes a transition around a temperature of 363 K. CsHgCl3 has a high dielectric constant, making it a potential choice for energy harvesting devices. The frequency-dependent "ac" conductivity, evaluated using Jonscher's law, was built to be temperature-dependent. In addition, the low activation energy can reveal the electronic conduction of this material. Several models based on Elliott's theory were used to investigate the conduction mechanism. In the first region, the behavior was in line with the correlated barrier hopping (CBH) model, however, in the second region, the overlapping large polaron tunneling (OLPT) model was seen. Furthermore, the results show a notable improvement of the electrical conductivity when exposed to electrical polarization applied dc-biases of Vp = 0.5 to 3 V at ambient temperature. These findings highlight the impact of the studied material's enormous electro-resistance, which makes it a highly potential candidate for emerging technologies.