Abstract
Conventional transparent electrodes make use of indium tin oxide (ITO) and are commonly used in touch screens, flat panel displays and solar cells. Nearly 90% of ITO film market is for the touch screen application, which is expected to grow more and more in the future. Graphene is potential candidates for transparent conductive films for electrical and optoelectronic devices and various other applications due to its high electrical conductivity, chemical and physical stability. High-quality graphene films have been synthesized by microwave plasma treatment of a copper substrate with Joule heating using low concentration carbon source. The copper foils with A4 (211 mm X 297 mm) size are used as substrate. Few-layer graphene was deposited on the copper foil for a few minutes. The transfer of the graphene films to a desired target substrate is enabled by the wet-etching of the underlying copper foil. This is carried out by treating the film with an aqueous (NH4)2S2O8 solution after a support material is covered on the graphene/copper surface, in our case a surface protective sheet. The graphene/sheet film is placed on the 188-mm thick polyethylene terephthalate (PET) substrate (graphene facing the surface). The surface protective sheet is removed from a sheet/graphene/PET film. We measured the transmittance and sheet resistance of the graphene/PET by using a haze meter and a four probe method, respectively. The transmittance was 96% (except PET substrate) and the sheet resistance was about 500 ohm. Subsequently, graphene/PET film was doped with gold (III) chloride solution to decrease its sheet resistance. After doping processes, the sheet resistance of the graphene/PET films decreases below 150 ohm. Acknowledgment: This work is mainly based on results obtained from a project supported by New Energy and Industrial Technology Development Organization (NEDO).
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