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

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-30CC-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-30CD-0
Genre: Journal Article

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http://dx.doi.org/10.1063/1.4916558 (Publisher version)
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http://arxiv.org/abs/1503.05932 (Preprint)
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 Creators:
Sun, Jifeng1, 2, 3, Author
Mukhopadhyay, Saikat1, Author
Subedi, Alaska4, Author              
Siegrist, Theo2, 3, Author
Singh, David J.1, Author
Affiliations:
1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA, ou_persistent22              
2Department of Chemical and Biomedical Engineering, College of Engineering, Florida Agricultural and Mechanical University-Florida State University, 2525 Pottsdamer St., Tallahassee, Florida 32310, USA, ou_persistent22              
3National High Magnetic Field Laboratory, 1800 E. Paul Dirac Dr., Tallahassee, Florida 32310, USA, ou_persistent22              
4Theory of Complex Materials, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_2074318              

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Free keywords: Doping; Germanium; Thermoelectric effects; Elemental semiconductors; Boltzmann equations
 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.

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Language(s): eng - English
 Dates: 2015-02-262015-03-182015-03-262015-03-23
 Publication Status: Published in print
 Pages: 4
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1063/1.4916558
arXiv: 1503.05932
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Title: Applied Physics Letters
  Abbreviation : Appl. Phys. Lett.
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: - Volume / Issue: 106 (12) Sequence Number: 123907 Start / End Page: - Identifier: Other: 0003-6951
CoNE: /journals/resource/954922836223