Suppressed electronic contribution in thermal conductivity of Ge2Sb2Se4Te
<jats:title>Abstract</jats:title><jats:p>Integrated 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-ch...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Springer Science and Business Media LLC
2022
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| Online Access: | https://hdl.handle.net/1721.1/142619 |
| _version_ | 1826210918753632256 |
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| author | 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 Hopkins, Patrick E |
| author2 | Massachusetts Institute of Technology. Department of Materials Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Materials Science and Engineering 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 Hopkins, Patrick E |
| author_sort | Aryana, Kiumars |
| collection | MIT |
| description | <jats:title>Abstract</jats:title><jats:p>Integrated 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, Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Se<jats:sub>4</jats:sub>Te, 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 Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Se<jats:sub>4</jats:sub>Te 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 Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Se<jats:sub>4</jats:sub>Te, 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 Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Se<jats:sub>4</jats:sub>Te thin films such as thermal boundary conductance, specific heat, and sound speed from room temperature to 400 °C across varying thicknesses.</jats:p> |
| first_indexed | 2024-09-23T14:57:32Z |
| format | Article |
| id | mit-1721.1/142619 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T14:57:32Z |
| publishDate | 2022 |
| publisher | Springer Science and Business Media LLC |
| record_format | dspace |
| spelling | mit-1721.1/1426192023-06-20T16:55:33Z Suppressed electronic contribution in thermal conductivity of Ge2Sb2Se4Te 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 Hopkins, Patrick E Massachusetts Institute of Technology. Department of Materials Science and Engineering <jats:title>Abstract</jats:title><jats:p>Integrated 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, Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Se<jats:sub>4</jats:sub>Te, 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 Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Se<jats:sub>4</jats:sub>Te 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 Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Se<jats:sub>4</jats:sub>Te, 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 Ge<jats:sub>2</jats:sub>Sb<jats:sub>2</jats:sub>Se<jats:sub>4</jats:sub>Te thin films such as thermal boundary conductance, specific heat, and sound speed from room temperature to 400 °C across varying thicknesses.</jats:p> 2022-05-19T18:04:31Z 2022-05-19T18:04:31Z 2021 2022-05-19T17:55:45Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/142619 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). en 10.1038/S41467-021-27121-X Nature Communications Creative Commons Attribution 4.0 International License https://creativecommons.org/licenses/by/4.0 application/pdf Springer Science and Business Media LLC Nature |
| spellingShingle | 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 Hopkins, Patrick E Suppressed electronic contribution in thermal conductivity of Ge2Sb2Se4Te |
| title | Suppressed electronic contribution in thermal conductivity of Ge2Sb2Se4Te |
| title_full | Suppressed electronic contribution in thermal conductivity of Ge2Sb2Se4Te |
| title_fullStr | Suppressed electronic contribution in thermal conductivity of Ge2Sb2Se4Te |
| title_full_unstemmed | Suppressed electronic contribution in thermal conductivity of Ge2Sb2Se4Te |
| title_short | Suppressed electronic contribution in thermal conductivity of Ge2Sb2Se4Te |
| title_sort | suppressed electronic contribution in thermal conductivity of ge2sb2se4te |
| url | https://hdl.handle.net/1721.1/142619 |
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