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

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

doi:10.1063/1.4916558

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

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

Oak Ridge National Laboratory
FAMU-FSU College of Engineering
Natl. High Magnetic Field Laboratory
Max Planck Institute for the Structure and Dynamics of Matter

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Article number	123907
Journal	Applied Physics Letters
Volume	106
Issue number	12
DOIs	https://doi.org/10.1063/1.4916558
Publication status	Published - 23 Mar 2015
Externally published	Yes

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10.1063/1.4916558

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title = "Transport properties of cubic crystalline Ge2Sb2Te5: A potential low-temperature thermoelectric material",

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.",

author = "Jifeng Sun and Saikat Mukhopadhyay and Alaska Subedi and Theo Siegrist and Singh, \{David J.\}",

note = "Publisher Copyright: {\textcopyright} 2015 AIP Publishing LLC.",

year = "2015",

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doi = "10.1063/1.4916558",

language = "English",

volume = "106",

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TY - JOUR

T1 - Transport properties of cubic crystalline Ge2Sb2Te5

T2 - A potential low-temperature thermoelectric material

AU - Sun, Jifeng

AU - Mukhopadhyay, Saikat

AU - Subedi, Alaska

AU - Siegrist, Theo

AU - Singh, David J.

PY - 2015/3/23

Y1 - 2015/3/23

N2 - 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.

AB - 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.

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DO - 10.1063/1.4916558

M3 - Article

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VL - 106

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 12

M1 - 123907

ER -

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

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