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Reversible optical doping of graphene.

A Tiberj¹, M Rubio-Roy, M Paillet

¹Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095, Montpellier, France. Antoine.Tiberj@univ-montp2.fr

Scientific Reports

|August 6, 2013

Summary

Visible light can tune graphene

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Area of Science:

Materials Science
Nanotechnology
Condensed Matter Physics

Background:

Graphene's large surface area makes it ideal for sensors.
Environmental factors can alter graphene's properties.

Purpose of the Study:

To investigate photo-induced doping in graphene.
To explore substrate effects on graphene's electronic properties.

Main Methods:

Exfoliation of graphene on SiO2/Si substrates.
Tuning charge carrier density using visible photons.
Raman spectroscopy to analyze graphene properties.

Main Results:

Charge carrier density in graphene was reversibly tuned by visible light.
Photo-induced doping requires hydrophilic substrates and is absent in suspended graphene.

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Substrate cleaning methods significantly impact photo-induced doping.

Conclusions:

Optically gated graphene devices with sub-second response times are feasible.
Raman spectroscopy may not be entirely non-invasive for graphene analysis.