A new model is developed that accounts for multiple phonon processes on interface transmission between two solids. By considering conservation of energy and phonon population, the decay of a high energy phonon in one material into several lower energy phonons in another material is modeled assuming diffuse scattering. The individual contributions of each of the higher order inelastic phonon processes to thermal boundary conductance are calculated and compared to the elastic contribution. The overall thermal boundary conductance from elastic and inelastic (three or more phonon processes) scattering is calculated and compared to experimental data on five different interfaces. Improvement in value and trend is observed by taking into account multiple phonon inelastic scattering. Three phonon interfacial processes are predicted to dominate the inelastic contribution to thermal boundary conductance.
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1 July 2009
Research Article|
July 15 2009
Multiple phonon processes contributing to inelastic scattering during thermal boundary conductance at solid interfaces
Patrick E. Hopkins
Patrick E. Hopkins
a)
Engineering Sciences Center,
Sandia National Laboratories
, P.O. Box 5800, Albuquerque, New Mexico 87185-0346, USA
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a)
Electronic mail: pehopki@sandia.gov.
J. Appl. Phys. 106, 013528 (2009)
Article history
Received:
November 20 2008
Accepted:
June 09 2009
Citation
Patrick E. Hopkins; Multiple phonon processes contributing to inelastic scattering during thermal boundary conductance at solid interfaces. J. Appl. Phys. 1 July 2009; 106 (1): 013528. https://doi.org/10.1063/1.3169515
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