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

Sun, Jifeng; Mukhopadhyay, Saikat; Subedi, Alaska; Siegrist, Theo; Singh, David J.

doi:10.1063/1.4916558

Title: Transport properties of cubic crystalline Ge₂Sb₂Te₅: a potential low-temperature thermoelectric material.

Journal Article · Thu Mar 26 00:00:00 EDT 2015 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4916558· OSTI ID:1185944

Sun, Jifeng ^[1]; Mukhopadhyay, Saikat ^[1]; Subedi, Alaska ^[2]; Siegrist, Theo ^[3]; Singh, David J. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Max Planck Inst. for the Structure and Dynamics of Matter (MPSD), Hamburg (Germany)
Florida State Univ., Tallahassee, FL (United States)

Ge₂Sb₂Te₅ (GST) has been widely used as a popular phase change material. In this study, we show that it exhibits high Seebeck coe cients 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 coe cient 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), our results suggest the possibility of using c-GST as a low-temperature thermoelectric material.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1185944

Journal Information:: Applied Physics Letters, Vol. 106, Issue 12; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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Title: Transport properties of cubic crystalline Ge₂Sb₂Te₅: a potential low-temperature thermoelectric material.