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Sintering Behavior of Copper Nanoparticle Ink by Laser in Air.

This paper presents a sintering technique using a laser in air which can provide heat for a few hundred milliseconds. In this study, a laser having a wavelength of 532 nm and a maximum-power output of 5 W was used. The effects of irradiated laser power at 104-282 W/cm² and sintering time of 50-330 milliseconds applied on spin-coated copper nanoparticle ink were investigated. The residual organic agent, oxidation, and specific resistance of the laser-sintered copper nanoparticle ink were characterized, and the sintering behavior was analyzed. For application, laser-sintered copper nanoparticle ink was confirmed to offer acceptable performance as a source and drain electrode in a thin-film transistor.