Role of electron–phonon coupling in thermal conductance of metal–nonmetal interfaces

Majumdar, Arun; Reddy, Pramod
June 2004
Applied Physics Letters;6/7/2004, Vol. 84 Issue 23, p4768
Academic Journal
We theoretically show that the thermal conductance associated with electron-phonon coupling in a metal near a metal-nonmetal interface can be estimated as hep = &rad;Gkp, where G is the volumetric electron-phonon coupling constant and kp is the phonon or lattice thermal conductivity of the metal. The expression suggests hep &assymp; 1/&rad;l at temperatures comparable to the Debye temperature of the metal. The predicted values of hep fall within the range of conductance values experimentally observed (0.3–1 GW/m²K), suggesting that it cannot be ignored, and could even play a dominant role at high temperatures. Predictions of the total thermal conductance, that include both electron-phonon and phonon-phonon interfacial conductances, show reasonable agreement in its temperature dependence with experimental data for TiN/MgO interfaces.


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