Silver conductor fabrication by laser direct writing on Al₂O₃ substrate

Abstract

A novel technology for manufacturing circuitry, differing from conventional methods, called laser micro-cladding electronic pastes is presented. In this article, high-quality silver conductors were made on an Al₂O₃ substrate by this method. The process and corresponding mechanisms are described in detail. The experimental results show that the conductive lines produced have a minimum line width of 20 μm, which is much smaller than the current limitations of conventional processes. The resistivity can reach the order of 10^-6 Ω cm, which is the same level for pure bulk silver. Optical micrographs and SEM morphology observations were also carried out.