TITLE

Behavior of a chemically doped graphene junction

AUTHOR(S)
Farmer, Damon B.; Yu-Ming Lin; Afzali-Ardakani, Ali; Avouris, Phaedon
PUB. DATE
May 2009
SOURCE
Applied Physics Letters;5/25/2009, Vol. 94 Issue 21, p213106
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Polyethylene imine and diazonium salts are used as complementary molecular dopants to engineer a doping profile in a graphene transistor. Electronic transport in this device reveals the presence of two distinct resistance maxima, alluding to neutrality point separation and subsequent formation of a spatially abrupt junction. Carrier mobility in this device is not significantly affected by molecular doping or junction formation, and carrier transmission is found to scale inversely with the effective channel length of the device. Chemical dilutions are used to modify the dopant concentration and, in effect, alter the properties of the junction.
ACCESSION #
40637746

 

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