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Preparation of a glyoxylic acid copper complex and fabrication of fine copper wire by CO2 laser ir- radiation in air to a thin film of that complex have been investigated. Irradiating laser to the com- plex thin film spin-coated on a glass substrate, thin film of metallic copper was fabricated in areas that were subjected to laser irradiation in air. The thickness of this thin copper film was approx. 30 to 40 nm, and as non-irradiated areas were etched and removed by a soluble solvent of the copper complex, fine copper wire with 200 µm width was formed by laser direct patterning. The resistivity of this thin copper film depended on the irradiation intensity of the laser and was 3.0 × 10−5 Ω·cm at 12 W intensity (sweep speed: 20 mm/s). This method enables the high-speed deposi- tion of copper wiring in air by a printing process, indicating an inexpensive and useful process for fabricating copper wiring.

Fabrication of Copper Wire Using Glyoxylic Acid Copper Complex and Laser Irradiation in Air