Highly stable Transparent Conducting Electrode in Corrosive Environments based on Low Temperature Grown Graphene on Cu/Ni metal mesh by Carbon-Enclosed Chemical Vapor Deposition
Arumugam Manikandan1*, Yu-Ze Chen1, Henry Medina1, Hung-Wei Tsai1, Yi-Chung Wang1, Yu-Ting Yen1, Yu-Lun Chueh1
1Department of Material Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan
* presenting author:Manikandan Arumugam, email:mani111nano@gmail.com
Replacing indium doped tin oxide (ITO) by metallic nanowires, metal mesh, CNT and graphene plays key role due to scarcity of indium and it’s brittleness for flexible optoelectronic devices. However, metallic nanowires have equivalent performance like ITO it suffers oxidation and corrosion problems. In this study, we proposed a new technique to achieve low temperature deposition of graphene via carbon-enclosed chemical vapor deposition(CE-CVD) on Cu/Ni metal mesh of thickness 80 nm deposited onto commercial glass to replace ITO. By utilizing this method graphene can be synthesized on Cu and Ni films at temperatures close to 500 C which is due to graphite plate and a carbon coated tube. Furthermore, the graphene synthesized by this method shows a sheet resistance of 150~200 Ω/ and mobility of 1K~2K cm2/V.s which is comparable with the normal CVD method at high temperature. During the process of decomposition of methane, the surrounding carbon would be able to catalyze methane even at a low temperature. By using a graphite plate as a holder, an additional carbon feedstock is supplied to the procedure in order to cure the defective graphene formed at low temperature giving as a result a high quality graphene formed at low temperature. The diminished D band on the Raman spectra revealed the high quality of graphene synthesized on the top of the metal mesh highlighting the uniqueness of this approach. Furthermore, the optical transmittance of metal meshes with segregation of graphene on glass is up to 93% with a sheet resistance of 5 Ω/, satisfying the criteria of transparent conductive electrodes. More interestingly, graphene coted Cu/Ni metal mesh on glass show excellent oxidation resistance without sacrificing electrical conductivity even after 2 hr annealing at 300 C in air and also shows an excellent anti-corrosion in highly corrosive electroplating solutions. We anticipate highly stable non-corrosive and anti-oxidant graphene coated Cu/Ni metal mesh can be used as an alternative transparent conducting electrode (TCE) for emerging optoelectronic devices and applications working in harsh environments.

Keywords: graphene, transparent conducting electrode, copper-Nickel, low temperature , corrosive environment