High-Field Electrical and Thermal Transport in Suspended Graphene

We study the intrinsic transport properties of suspended graphene devices at high fields (>1 V/um) and high temperatures (>1000 K). Across 15 samples, we find peak (average) saturation velocity of 3.6x10^7 cm/s (1.7x10^7 cm/s), and peak (average) thermal conductivity of 530 W/m/K (310 W/m/K),...

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Bibliographic Details
Published in:arXiv.org 2013-11
Main Authors: Dorgan, Vincent E, Behnam, Ashkan, Conley, Hiram J, Bolotin, Kirill I, Pop, Eric
Format: Article
Language:English
Subjects:
Electrical resistivity
Extreme environments
Graphene
Heat conductivity
Heat transfer
Heat transmission
High temperature
Saturation
Thermal conductivity
Transport properties
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Summary:We study the intrinsic transport properties of suspended graphene devices at high fields (>1 V/um) and high temperatures (>1000 K). Across 15 samples, we find peak (average) saturation velocity of 3.6x10^7 cm/s (1.7x10^7 cm/s), and peak (average) thermal conductivity of 530 W/m/K (310 W/m/K), at 1000 K. The saturation velocity is 2-4 times and the thermal conductivity 10-17 times greater than in silicon at such elevated temperatures. However, the thermal conductivity shows a steeper decrease at high temperature than in graphite, consistent with stronger effects of second-order three-phonon scattering. Our analysis of sample-to-sample variation suggests the behavior of "cleaner" devices most closely approaches the intrinsic high-field properties of graphene. This study reveals key features of charge and heat flow in graphene up to device breakdown at ~2230 K in vacuum, highlighting remaining unknowns under extreme operating conditions.
ISSN:2331-8422
DOI:10.48550/arxiv.1302.5440