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Transport properties of cubic crystalline Ge2Sb2Te5: A potential low-temperature thermoelectric material

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Subedi,  Alaska
Theory of Complex Materials, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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1.4916558.pdf
(Publisher version), 833KB

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Citation

Sun, J., Mukhopadhyay, S., Subedi, A., Siegrist, T., & Singh, D. J. (2015). Transport properties of cubic crystalline Ge2Sb2Te5: A potential low-temperature thermoelectric material. Applied Physics Letters, 106(12): 123907. doi:10.1063/1.4916558.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-30CC-1
Abstract
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 of 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) [K. S. Siegert et al., Rep. Prog. Phys. 78, 013001 (2015)], our results suggest the possibility of using c-GST as a low-temperature thermoelectric material.