Patent ID: 6621165
Filing Date: 2003-09-16
Classification: H01L

Abstract:
A semiconductor device, having a contaminant-reduced copper-calcium alloy surface on a copper (Cuâ€”Ca/Cu) interconnect structure, comprising:a semiconductor substrate; a Cu film deposited on the semiconductor substrate; and a Cuâ€”Ca alloy surface deposited on the Cu film, the Cu film comprising a electroless plating treatment, said electroless plating treatment comprising an electroless plating solution for facilitating doping of the Cu film with at least one plurality of ions selected from a group consisting essentially of Cu ions and Ca ions, whereby a Cuâ€”Caâ€”X film is formed on the Cu film, wherein X denotes at least one contaminant, the Cuâ€”Caâ€”X film comprising a removing technique selected from a group consisting essentially of: sputtering under an Ar atmosphere, and treating in a plasma ambient for initially removing the at least one contaminant, and whereby a thin Cuâ€”Ca film is effected on the Cu film, the thin Cuâ€”Ca film comprising an annealing treatment for finally removing the at least one contaminant, the thin Cuâ€”Ca film being alloyed, whereby a contaminant-reduced Cuâ€”Ca alloy surface is formed onto the Cu film, and whereby the contaminant-reduced Cuâ€”Ca/Cu interconnect structure, comprising the contaminant-reduced Cuâ€”Ca alloy surface, is formed on the semiconductor device, the Cu film comprising a depositing technique selected from a group consisting essentially of electroplating, electroless plating, chemical vapor deposition (CVD), plasma vapor deposition (PVD), and plasma enhanced chemical vapor deposition (PECVD), the electroless plating solution comprising: a. at least one solvent; b. at least one Cu salt; c. at least one Ca salt; d. at least one complexing agent; and e. at least one reducing agent, (b) through (e) being dissolved in (a), electroless plating solution further comprising: f. at least one pH adjuster; and g. at least one surfactant, (f) and (g) being dissolved in (a), and the at least one contaminant being selected from a group consisting essentially of carbon (C), sulphur (S), and oxygen (O).