Thermal conductance across harmonic-matched epitaxial Al-sapphire heterointerfaces
| Autor: | Renjiu Hu, Habib Ahmad, Christopher M. Matthews, Zhiting Tian, Tengfei Luo, W. Alan Doolittle, Jingjing Shi, Zhe Cheng, Tingyu Bai, Patrick E. Hopkins, Michael E. Liao, Mark S. Goorsky, Yekan Wang, Ruiyang Li, Evan A. Clinton, Yee Rui Koh, Eungkyu Lee, Zachary Engel, Luke Yates, Samuel Graham |
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| Rok vydání: | 2020 |
| Předmět: |
Work (thermodynamics)
Materials science Phonon FOS: Physical sciences General Physics and Astronomy lcsh:Astrophysics Applied Physics (physics.app-ph) 02 engineering and technology 01 natural sciences Heat capacity Condensed Matter::Materials Science Thermal conductivity Condensed Matter::Superconductivity Mesoscale and Nanoscale Physics (cond-mat.mes-hall) lcsh:QB460-466 0103 physical sciences Thermal Transmission coefficient 010306 general physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Conductance Physics - Applied Physics 021001 nanoscience & nanotechnology lcsh:QC1-999 13. Climate action Sapphire 0210 nano-technology lcsh:Physics |
| Zdroj: | Communications Physics, Vol 3, Iss 1, Pp 1-8 (2020) |
| ISSN: | 2399-3650 |
| DOI: | 10.1038/s42005-020-0383-6 |
| Popis: | A unified understanding of interfacial thermal transport is missing due to the complicated nature of interfaces which involves complex factors such as interfacial bonding, interfacial mixing, surface chemistry, crystal orientation, roughness, contamination, and interfacial disorder. This is especially true for metal nonmetal interfaces which incorporate multiple fundamental heat transport mechanisms such as elastic and inelastic phonon scattering as well as electron phonon coupling in the metal and across the interface. All these factors jointly affect thermal boundary conductance (TBC). As a result, the experimentally measured interfaces may not be the same as the ideally modelled interfaces, thus obfuscating any conclusions drawn from experimental and modeling comparisons. This work provides a systematic study of interfacial thermal conductance across well controlled and ultraclean epitaxial (111) Al parallel (0001) sapphire interfaces, known as harmonic matched interface. A comparison with thermal models such as atomistic Green s function (AGF) and a nonequilibrium Landauer approach shows that elastic phonon scattering dominates the interfacial thermal transport of Al sapphire interface. By scaling the TBC with the Al heat capacity, a nearly constant transmission coefficient is observed, indicating that the phonons on the Al side limits the Al sapphire TBC. This nearly constant transmission coefficient validates the assumptions in AGF and nonequilibrium Landauer calculations. Our work not only provides a benchmark for interfacial thermal conductance across metal nonmetal interfaces and enables a quantitative study of TBC to validate theoretical thermal carrier transport mechanisms, but also acts as a reference when studying how other factors impact TBC. |
| Databáze: | OpenAIRE |
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