Patent ID: 6444580
Filing Date: 2002-09-03
Classification: H01L

Abstract:
A method of fabricating a semiconductor device having a contaminant-reduced copper-calcium alloy surface on a copper (Cuâ€”Ca/Cu) interconnect structure, comprising:a. providing a semiconductor substrate; b. depositing a copper (Cu) film on the semiconductor substrate; c. treating the Cu film in an electroless plating solution for facilitating doping of the Cu film with at least one plurality of ions selected from a group of ions consisting essentially of Cu ions and calcium (Ca) ions, thereby forming a Cuâ€”Caâ€”X film on the Cu film, wherein X denotes at least one contaminant; d. processing the Cuâ€”Caâ€”X film by a technique selected from a group of techniques consisting essentially of: (1) sputtering under an argon (Ar) atmosphere, and (2) treating in a plasma ambient, thereby removing the at least one contaminant, and thereby effecting a thin Cuâ€”Ca film on the Cu film; e. annealing the thin Cuâ€”Ca film, whereby the thin Cuâ€”Ca film is alloyed, thereby forming a contaminant-reduced Cuâ€”Ca alloy surface on the Cu film, and thereby forming the contaminant-reduced Cuâ€”Ca/Cu interconnect structure comprising the contaminant-reduced Cuâ€”Ca alloy surface on the semiconductor substrate; and f. completing formation of the semiconductor device.