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Park, Hyesung
Low-Dimensional Materials & Energy Conversion Lab
Research Interests
  • Nano materials, renewable energy, optoelectronic devices

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Enhancing the conductivity of transparent graphene films via doping

Cited 132 times inthomson ciCited 80 times inthomson ci
Title
Enhancing the conductivity of transparent graphene films via doping
Author
Kim, Ki KangReina, AlfonsoShi, YumengPark, HyesungLi, Lain-JongLee, Young HeeKong, Jing
Keywords
2 layer; Atomic force microscopes; Au particles; Chemical doping; Conducting films; Doping concentration; Doping effects; Effect of doping; Indium tin oxide; Nitromethane; P-type; P-type doping; Poly(ethylene terephthalate) substrate; Quartz substrate; Scanning Electron Microscope; Transparent conducting electrodes; Transparent conducting films
Issue Date
2010-07
Publisher
IOP PUBLISHING LTD
Citation
NANOTECHNOLOGY, v.21, no.28, pp.1 - 6
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 10-100nm. The effect of doping was also investigated by transferring the graphene films onto quartz and poly(ethylene terephthalate) substrates. The sheet resistance reached 150 Ω/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.
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DOI
10.1088/0957-4484/21/28/285205
ISSN
0957-4484
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ECHE_Journal Papers
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