Enhancing the conductivity of transparent graphene films via doping
- 28 June 2010
- journal article
- research article
- Published by IOP Publishing in Nanotechnology
- Vol. 21 (28), 285205
- https://doi.org/10.1088/0957-4484/21/28/285205
Abstract
We report chemical doping (p-type) to reduce the sheet resistance of graphene films for the application of high-performance transparent conducting films. The graphene film synthesized by chemical vapor deposition was transferred to silicon oxide and quartz substrates using poly(methyl methacrylate). AuCl3 in nitromethane was used to dope the graphene films and the sheet resistance was reduced by up to 77% depending on the doping concentration. The p-type doping behavior was confirmed by characterizing the Raman G-band of the doped graphene film. Atomic force microscope and scanning electron microscope images reveal the deposition of Au particles on the film. The sizes of the Au particles are 10-100 nm. The effect of doping was also investigated by transferring the graphene films onto quartz and poly(ethylene terephthalate) substrates. The sheet resistance reached 150 Omega/sq at 87% transmittance, which is comparable to those of indium tin oxide conducting film. The doping effect was manifested only with 1-2 layer graphene but not with multi-layer graphene. This approach advances the numerous applications of graphene films as transparent conducting electrodes.This publication has 37 references indexed in Scilit:
- Efficient Reduction of Graphite Oxide by Sodium Borohydride and Its Effect on Electrical ConductanceAdvanced Functional Materials, 2009
- Large-scale pattern growth of graphene films for stretchable transparent electrodesNature, 2009
- Highly conducting graphene sheets and Langmuir–Blodgett filmsNature Nanotechnology, 2008
- Fine Structure Constant Defines Visual Transparency of GrapheneScience, 2008
- Large-area ultrathin films of reduced graphene oxide as a transparent and flexible electronic materialNature Nanotechnology, 2008
- Epitaxial graphene on rutheniumNature Materials, 2008
- Effect of Acid Treatment on Carbon Nanotube-Based Flexible Transparent Conducting FilmsJournal of the American Chemical Society, 2007
- Electronic Confinement and Coherence in Patterned Epitaxial GrapheneScience, 2006
- Two-dimensional gas of massless Dirac fermions in grapheneNature, 2005
- Effect of film thickness on the properties of indium tin oxide thin filmsJournal of Applied Physics, 2000