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Issue 28, 2015
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Dramatic vapor-phase modulation of the characteristics of graphene field-effect transistors

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Abstract

Here we report on dramatic and favorable changes to the operating characteristics in monolayer graphene field-effect transistors (FETs) exposed to vapor-phase, polar organic molecules in ambient. These changes include significant reduction of the Dirac voltage, accompanied by both an increase in electron and hole mobility, μ, and a decrease in residual carrier density, N0, to < 3 × 1011 cm−2. In contrast to graphene FET modulation with various liquid- and solid-phase dielectric media present in the literature, we attribute these changes to screening by polar vapor-phase molecules of fields induced by charged impurities and defects, nimp, in or near the active layer. The magnitude of the changes produced in the graphene FET parameters scales remarkably well with the dipole moment of the delivered molecules. These effects are reversible, a unique advantage of working in the vapor phase. The changes observed upon polar molecule delivery are analogous to those produced by depositing and annealing fluoropolymer coatings on graphene that have been reported previously, and we attribute these changes to similar charge screening or neutralization phenomena.

Graphical abstract: Dramatic vapor-phase modulation of the characteristics of graphene field-effect transistors

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Article information


Submitted
31 Mar 2015
Accepted
17 Jun 2015
First published
18 Jun 2015

Phys. Chem. Chem. Phys., 2015,17, 18426-18430
Article type
Paper

Dramatic vapor-phase modulation of the characteristics of graphene field-effect transistors

B. C. Worley, S. Kim, S. Park, P. J. Rossky, D. Akinwande and A. Dodabalapur, Phys. Chem. Chem. Phys., 2015, 17, 18426
DOI: 10.1039/C5CP01888A

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