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Mechanisms of doping graphene

✍ Scribed by Pinto, H. (author);Jones, R. (author);Goss, J. P. (author);Briddon, P. R. (author)

Publisher: Wiley
Year: 2010
Tongue: English
Weight: 655 KB
Volume: 207
Category: Article
ISSN: 0031-8965
DOI: 10.1002/pssa.201000009

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✦ Synopsis

Abstract

We distinguish three mechanisms of doping graphene. Density functional theory is used to show that electronegative molecules like tetrafluoro‐tetracyanoquinodimethane (F4‐TCNQ) and electropositive metals like K dope graphene p‐ and n‐ type, respectively. These dopants are expected to lead to a decrease in carrier mobility arising from Coulomb scattering but without any hysteresis effects. Secondly, a novel doping mechanism is exhibited by Au which dopes bilayer graphene but not single layer. Thirdly, electrochemical doping is effected by redox reactions and can result in p‐doping by humid atmospheres and n‐doping by NH~3~ and toluene.

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