Heat Conduction across Monolayer and Few-Layer Graphenes

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 red...

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Bibliographic Details
Published in:Nano letters 2010-11, Vol.10 (11), p.4363-4368
Main Authors: Koh, Yee Kan, Bae, Myung-Ho, Cahill, David G, Pop, Eric
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Crystallization - methods
Electronics
Energy Transfer
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
Gold - chemistry
Graphite - chemistry
Lattice dynamics
Macromolecular Substances - chemistry
Materials science
Materials Testing
Microelectrodes
Molecular Conformation
Molecular electronics, nanoelectronics
Nanostructures - chemistry
Nanostructures - ultrastructure
Particle Size
Phonons in low-dimensional structures and small particles
Physics
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Specific materials
Surface Properties
Thermal Conductivity
Thermal properties of condensed matter
Thermal properties of small particles, nanocrystals, nanotubes
Titanium - chemistry
Transistors, Electronic
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Summary: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 suggest that metal contacts can limit not only electrical transport but also thermal dissipation from submicrometer graphene devices.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl101790k