Energy Dissipation in Graphene Field-Effect Transistors
Top Cited Papers
- 30 March 2009
- journal article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 9 (5), 1883-1888
- https://doi.org/10.1021/nl803883h
Abstract
We measure the temperature distribution in a biased single-layer graphene transistor using Raman scattering microscopy of the 2D-phonon band. Peak operating temperatures of 1050 K are reached in the middle of the graphene sheet at 210 kW cm−2 of dissipated electric power. The metallic contacts act as heat sinks, but not in a dominant fashion. To explain the observed temperature profile and heating rate, we have to include heat flow from the graphene to the gate oxide underneath, especially at elevated temperatures, where the graphene thermal conductivity is lowered due to umklapp scattering. Velocity saturation due to phonons with about 50−60 meV energy is inferred from the measured charge density via shifts in the Raman G-phonon band, suggesting that remote scattering (through field coupling) by substrate polar surface phonons increases the energy transfer to the substrate and at the same time limits the high-bias electronic conduction of graphene.Keywords
This publication has 32 references indexed in Scilit:
- Operation of Graphene Transistors at Gigahertz FrequenciesNano Letters, 2009
- Temperature-Dependent Transport in Suspended GraphenePhysical Review Letters, 2008
- Approaching ballistic transport in suspended grapheneNature Nanotechnology, 2008
- Chemically Derived, Ultrasmooth Graphene Nanoribbon SemiconductorsScience, 2008
- Graphene nano-ribbon electronicsPhysica E: Low-dimensional Systems and Nanostructures, 2007
- Energy Band-Gap Engineering of Graphene NanoribbonsPhysical Review Letters, 2007
- The rise of grapheneNature Materials, 2007
- Two-dimensional gas of massless Dirac fermions in grapheneNature, 2005
- Experimental observation of the quantum Hall effect and Berry's phase in grapheneNature, 2005
- Electric Field Effect in Atomically Thin Carbon FilmsScience, 2004