TITLE

Mobility and saturation velocity in graphene on SiO2

AUTHOR(S)
Dorgan, Vincent E.; Myung-Ho Bae; Pop, Eric
PUB. DATE
August 2010
SOURCE
Applied Physics Letters;8/23/2010, Vol. 97 Issue 8, p082112
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We examine mobility and saturation velocity in graphene on SiO2 above room temperature (300–500 K) and at high fields (∼1 V/μm). Data are analyzed with practical models including gated carriers, thermal generation, “puddle” charge, and Joule heating. Both mobility and saturation velocity decrease with rising temperature above 300 K, and with rising carrier density above 2×1012 cm-2. Saturation velocity is >3×107 cm/s at low carrier density, and remains greater than in Si up to 1.2×1013 cm-2. Transport appears primarily limited by the SiO2 substrate but results suggest intrinsic graphene saturation velocity could be more than twice that observed here.
ACCESSION #
53421531

 

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