Novel Silver-seed Semi-Additive Process for High Quality Circuit Formation

We propose a novel silver-seed semi-additive process (S-SAP) for fabricating electrical circuit of high quality. Thin coated silver layer is used as a conductive seed for plating and is easily removed by selective etching without defects of plated copper wirings. In this system, it was found that the reproducibility of the designed circuit design and the rectangular shape of the wiring are maintained. Therefore, this process has great advantages against the conventional MSAP utilizing copper seed. Here, we will report the results of demonstration of electrical circuit fabrication by silver-seed SAP and discuss the difference between the new process (S-SAP) and conventional Cu-MSAP.