Thermal conductivity of (Ge2Sb2Te5)1–xCx phase change films

Scott, Ethan Adam; Ziade, Elbara; Saltonstall, Christopher Blair; McDonald, Anthony E.; Rodriguez, Mark A.; Hopkins, Patrick E.; Beechem, Thomas Edwin; Adams, David P.

doi:10.1063/5.0023476

Thermal conductivity of (Ge₂Sb₂Te₅)_1–xCx phase change films

Journal Article · Mon Oct 19 00:00:00 EDT 2020 · Journal of Applied Physics

DOI:https://doi.org/10.1063/5.0023476· OSTI ID:1691448

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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)

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–xC_x 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.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies (CINT)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1691448

Alternate ID(s):: OSTI ID: 1678749

Report Number(s):: SAND--2020-11090J; 691436

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 15 Vol. 128; ISSN 0021-8979

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

Country of Publication:: United States

Language:: English

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