Electrochemical planarization by selective electroplating for embedded gold wiring in the sub-micron range

Abstract

A planar Au metallization process by electrolytic plating has been developed for metal interconnections in the submicron range. Gold wires with high aspect ratio were fabricated in an embedded structure within the dielectric spacer. By etching of Au and oxidizing the surface of TiW in the field, the gold wires can be selectively formed within the dielectric. This process can provide desired properties of conductor structures for Si LSI applications.