  Ge$_{2}$Sb$_{2}$Te$_{5}$ (GST) has been widely used as a popular phase change
material. In this study, we show that it exhibits high Seebeck coefficients 200
- 300 $\mu$V/K in its cubic crystalline phase ($\it{c}$-GST) at remarkably high
$\it{p}$-type doping levels of $\sim$ 1$\times$10$^{19}$ - 6$\times$10$^{19}$
cm$^{-3}$ at room temperature. More importantly, at low temperature (T = 200
K), the Seebeck coefficient was found to exceed 200 $\mu$V/K for a doping range
1$\times$10$^{19}$ - 3.5$\times$10$^{19}$ cm$^{-3}$. Given that the lattice
thermal conductivity in this phase has already been measured to be extremely
low ($\sim$ 0.7 W/m-K at 300 K),\citep{r51} our results suggest the possibility
of using $\it{c}$-GST as a low-temperature thermoelectric material.
