Abstract
Lead content in perovskite solar cells and other applications is toxic for human health and environment. Therefore, the search alternate materials are required of present era. In this article, we presented physical properties of Rb/Cs2TeI6 defective perovskites for possible solar cell and thermoelectric applications. These compounds were found to be stable in perovskite structure. The band gaps were calculated in close contact to experiments. The optical properties were computed in term of dielectric function, refractive index and optical conductivity. These properties explored suitability of Rb/Cs2TeI6 perovskites for solar cell applications. Also, the high figure of merit (0.687 for Rb2TeI6 and 0.682 for Cs2TeI6 at 1000 K) confirmed position of these compounds in family of efficient thermoelectric materials.