Suppressed electronic contribution in thermal conductivity of Ge2Sb2Se4Te
Name
s41467-021-27121-x.pdf
Description
Published version
Size
2.38 MB
Format
Adobe PDF
Checksum (MD5)
511dacbde46b4606ed819fe900147533
Author(s)
Aryana, Kiumars
Zhang, Yifei
Tomko, John A
Hoque, Md Shafkat Bin
Hoglund, Eric R
Olson, David H
Nag, Joyeeta
Read, John C
Ríos, Carlos
Hu, Juejun
Date Issued
2021
Journal
Nature Communications
Publisher
Springer Science and Business Media LLC
Citation
Aryana, Kiumars, Zhang, Yifei, Tomko, John A, Hoque, Md Shafkat Bin, Hoglund, Eric R et al. 2021. "Suppressed electronic contribution in thermal conductivity of Ge2Sb2Se4Te." Nature Communications, 12 (1).
Version
Final published version
Abstract
AbstractIntegrated nanophotonics is an emerging research direction that has attracted great interests for technologies ranging from classical to quantum computing. One of the key-components in the development of nanophotonic circuits is the phase-change unit that undergoes a solid-state phase transformation upon thermal excitation. The quaternary alloy, Ge2Sb2Se4Te, is one of the most promising material candidates for application in photonic circuits due to its broadband transparency and large optical contrast in the infrared spectrum. Here, we investigate the thermal properties of Ge2Sb2Se4Te and show that upon substituting tellurium with selenium, the thermal transport transitions from an electron dominated to a phonon dominated regime. By implementing an ultrafast mid-infrared pump-probe spectroscopy technique that allows for direct monitoring of electronic and vibrational energy carrier lifetimes in these materials, we find that this reduction in thermal conductivity is a result of a drastic change in electronic lifetimes of Ge2Sb2Se4Te, leading to a transition from an electron-dominated to a phonon-dominated thermal transport mechanism upon selenium substitution. In addition to thermal conductivity measurements, we provide an extensive study on the thermophysical properties of Ge2Sb2Se4Te thin films such as thermal boundary conductance, specific heat, and sound speed from room temperature to 400 °C across varying thicknesses.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1038/S41467-021-27121-X
