Journal
EUROPEAN PHYSICAL JOURNAL B
Volume 88, Issue 6, Pages -Publisher
SPRINGER
DOI: 10.1140/epjb/e2015-50771-8
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Funding
- National Natural Science Foundation of China [11334007]
- program for New Century Excellent Talents in Universities [NCET-13-0431]
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [TP2014012]
- Shanghai Natural Science Foundation [14ZR1417000]
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We theoretically investigate the thermal boundary conductance across metal-nonmetal interfaces in the presence of the electron-phonon coupling not only in metal but also at interface. The thermal energy can be transferred from metal to nonmetal via three channels: (1) the phonon-phonon coupling at interface; (2) the electron-phonon coupling at interface; and (3) the electron-phonon coupling within metal and then subsequently the phonon-phonon coupling at interface. We find that these three channels can be described by an equivalent series-parallel thermal resistor network, based on which we derive out the analytic expression of the thermal boundary conductance. We then exemplify different contributions from each channel to the thermal boundary conductance in three typical interfaces: Pb-diamond, Ti-diamond, and TiN-MgO. Our results reveal that the competition among above channels determines the thermal boundary conductance.
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