| dc.description.abstract | Indiμm tin oxide (ITO) has good conductivity and transmittance, but it is brittle that cannot be used for flexible substrates.In recent years, many studies have searched for alternative materials for indium tin oxide (ITO). The metallic materials,such as gold, silver, and copper can be used to make flexible transparent electrodes. Their transparency and electrical conductivity are excellent, due to gold and silver are more expensive, but copper is easy to get oxidized form copper oxide on the surface and lose electrical properties. Therefore,this research is to find an electrode with reduced cost and oxidation resistance.
This research’s primary goal is to use laser direct writing to make flexible and oxidation-resistant metal mesh transparent electrodes. Changing the substrate from a glass substrate to a PI substrate to detect flexibility, at the environment of high temperature, electrodes with different ratios of copper and zinc oxide to detect their conductivity.
Copper formate and zinc acetate can be respectively reduced to copper and zinc oxide by heating. In this study, different ratios of copper formate and zinc acetate were dissolved in the solvent, and organometallic ink was prepared by spin coating on the glass substrate to form a uniform film and on the heating plate remove the excess solvent, focus 50 times with a continuous laser at a wavelength of 532 nm, thermally decompose and sinter copper formate and zinc acetate, and make a metal mesh with a mobile platform to achieve patterning, Finally, makeing the metal grid with its lines the width is 15μm, the average thickness is 650nm, the transmittance is 88%, and the resistivity can best reach 21×〖10〗^(-8) Ωm which is copper’s 13 times.
In the literature, copper is more likely to oxidize and lose electricity in high-temperature environments. In this study, pure copper metal grids and different proportions of copper and zinc oxide were placed on a 160°C heating plate and placed for 24 hours to detect resistance changes. The pure copper metal grid increases 106 times after 12 hours, the ratio of copper to zinc oxide is 4:1, and it only increases 25 times when placed for 24 hours.
After that mechanical were detected, the metal grid was sintered on the PI flexible substrate, and the bending radius was 5 mm. The bending was 5000 times, and the resistivity was 30×〖10〗^(-8) Ωm. The resistance change was 43%. | en_US |