Thermal conductivity of (Ge2Sb2Te5)1–xCx phase change films
Abstract
Germanium–antimony–telluride has emerged as a nonvolatile phase change memory material due to the large resistivity contrast between amorphous and crystalline states, rapid crystallization, and cyclic endurance. Improving thermal phase stability, however, has necessitated further alloying with optional addition of a quaternary species (e.g., C). In this work, the thermal transport implications of this additional species are investigated using frequency-domain thermoreflectance in combination with structural characterization derived from x-ray diffraction and Raman spectroscopy. Specifically, the room temperature thermal conductivity and heat capacity of (Ge2Sb2Te5)1–xCx are reported as a function of carbon concentration (x ≤ 0:12) and anneal temperature (T ≤ 350 °C) with results assessed in reference to the measured phase, structure, and electronic resistivity. Phase stability imparted by the carbon comes with comparatively low thermal penalty as materials exhibiting similar levels of crystallinity have comparable thermal conductivity despite the addition of carbon. The additional thermal stability provided by the carbon does, however, necessitate higher anneal temperatures to achieve similar levels of structural order.
- Authors:
-
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Univ. of Virginia, Charlottesville, VA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Univ. of Virginia, Charlottesville, VA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies (CINT)
- Publication Date:
- Research Org.:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies (CINT)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)
- OSTI Identifier:
- 1691448
- Alternate Identifier(s):
- OSTI ID: 1678749
- Report Number(s):
- SAND-2020-11090J
Journal ID: ISSN 0021-8979; 691436; TRN: US2204241
- Grant/Contract Number:
- AC04-94AL85000; 2006231; NA0003525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Applied Physics
- Additional Journal Information:
- Journal Volume: 128; Journal Issue: 15; Journal ID: ISSN 0021-8979
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 42 ENGINEERING; Thermal conductivity; Raman spectroscopy; Annealing; Thermodynamic properties; Phase change memories; Thermal transport; Materials properties; Frequency domain thermoreflectance; Crystal structure; X-ray diffraction
Citation Formats
Scott, Ethan Adam, Ziade, Elbara, Saltonstall, Christopher Blair, McDonald, Anthony E., Rodriguez, Mark A., Hopkins, Patrick E., Beechem, Thomas Edwin, and Adams, David P. Thermal conductivity of (Ge2Sb2Te5)1–xCx phase change films. United States: N. p., 2020.
Web. doi:10.1063/5.0023476.
Scott, Ethan Adam, Ziade, Elbara, Saltonstall, Christopher Blair, McDonald, Anthony E., Rodriguez, Mark A., Hopkins, Patrick E., Beechem, Thomas Edwin, & Adams, David P. Thermal conductivity of (Ge2Sb2Te5)1–xCx phase change films. United States. https://doi.org/10.1063/5.0023476
Scott, Ethan Adam, Ziade, Elbara, Saltonstall, Christopher Blair, McDonald, Anthony E., Rodriguez, Mark A., Hopkins, Patrick E., Beechem, Thomas Edwin, and Adams, David P. Mon .
"Thermal conductivity of (Ge2Sb2Te5)1–xCx phase change films". United States. https://doi.org/10.1063/5.0023476. https://www.osti.gov/servlets/purl/1691448.
@article{osti_1691448,
title = {Thermal conductivity of (Ge2Sb2Te5)1–xCx phase change films},
author = {Scott, Ethan Adam and Ziade, Elbara and Saltonstall, Christopher Blair and McDonald, Anthony E. and Rodriguez, Mark A. and Hopkins, Patrick E. and Beechem, Thomas Edwin and Adams, David P.},
abstractNote = {Germanium–antimony–telluride has emerged as a nonvolatile phase change memory material due to the large resistivity contrast between amorphous and crystalline states, rapid crystallization, and cyclic endurance. Improving thermal phase stability, however, has necessitated further alloying with optional addition of a quaternary species (e.g., C). In this work, the thermal transport implications of this additional species are investigated using frequency-domain thermoreflectance in combination with structural characterization derived from x-ray diffraction and Raman spectroscopy. Specifically, the room temperature thermal conductivity and heat capacity of (Ge2Sb2Te5)1–xCx are reported as a function of carbon concentration (x ≤ 0:12) and anneal temperature (T ≤ 350 °C) with results assessed in reference to the measured phase, structure, and electronic resistivity. Phase stability imparted by the carbon comes with comparatively low thermal penalty as materials exhibiting similar levels of crystallinity have comparable thermal conductivity despite the addition of carbon. The additional thermal stability provided by the carbon does, however, necessitate higher anneal temperatures to achieve similar levels of structural order.},
doi = {10.1063/5.0023476},
journal = {Journal of Applied Physics},
number = 15,
volume = 128,
place = {United States},
year = {Mon Oct 19 00:00:00 EDT 2020},
month = {Mon Oct 19 00:00:00 EDT 2020}
}
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