Transport Properties of Cubic Crystalline Ge₂Sb₂Te₅: A Potential Low-temperature Thermoelectric Material

الأصل · EN

Ge₂Sb₂Te₅ (GST) has been widely used as a popular phase change material. In this study, we show that it exhibits high Seebeck coefficients 200 - 300 μV/K in its cubic crystalline phase (c-GST) at remarkably high p-type doping levels of 1×10¹⁹ - 6×10¹⁹ cm⁻³ at room temperature. More importantly, at low temperature (T = 200 K), the Seebeck coefficient was found to exceed 200 μV/K for a doping range 1×10¹⁹ - 3.5×10¹⁹ cm⁻³. Given that the lattice thermal conductivity in this phase has already been measured to be extremely low (0.7 W/m-K at 300 K),r51 our results suggest the possibility of using c-GST as a low-temperature thermoelectric material.