Thermoelectric properties of all-inorganic perovskite CsSnBr3: A combined experimental and theoretical study

Halide perovskite semiconductors have been actively considered for thermoelectric applications. We report the thermoelectric properties of thermally stable, all-inorganic perovskite CsSnBr3 prepared by two methods. Between 300 and 600 K, both types of CsSnBr3 crystals showed analogous trends of increasing Seebeck coefficients S and plummeting electrical conductivities sigma. The counteraction between S and sigma followed a semilogarithmic relation derived from a single band model for the electronic band structure of CsSnBr3. The ZT value maximized at similar to 0.01 and its enhancement by extrinsic doping is possible. Our results help assess the potential of CsSnBr3 and other halide perovskites as thermoelectric materials.