We report the thermal conductance G of Au/Ti/graphene/SiO2 interfaces (graphene layers 1 < n < 10) typical of graphene transistor contacts. We find G ~ 25 MW m-2 K-1 at room temperature, four times smaller than the thermal conductance of a Au/Ti/SiO2 interface, even when n = 1. We attribute this reduction to the thermal resistance of Au/Ti/graphene and graphene/SiO2 interfaces acting in series. The temperature dependence of G from 50 < T < 500 K also indicates that heat is predominantly carried by phonons through these interfaces. Our findings indicate that metal contacts can limit not only electrical transport, but also thermal dissipation from sub-micron graphene devices.
@article{arxiv.1009.5151,
title = {Heat Conduction across Monolayer and Few-Layer Graphenes},
author = {Yee Kan Koh and Myung-Ho Bae and David G. Cahill and Eric Pop},
journal= {arXiv preprint arXiv:1009.5151},
year = {2010}
}
Comments
22 pages, 4 figures, accepted for publication in Nano Letters (2010) This paper has been withdrawn by the authors upon request by Nano Letters. The paper will be available in Nano Letters very soon