Patent ID: 6646353
Filing Date: 2003-11-11
Classification: H01L

Abstract:
A semiconductor device, having a contaminant-reduced copper-calcium alloy on copper (Cuâ€”Ca/Cu) interconnect structure in a via for reducing electromigration therein, comprising:a. a semiconductor substrate having the via; b. a copper (Cu) interconnect line deposited in the via; and c. a copper-calcium (Cuâ€”Ca) alloy surface deposited on the Cu interconnect line, the Cu interconnect line being treated in an electroless plating solution for facilitating selective doping of the Cu interconnect line with copper (Cu) and calcium (Ca), thereby selectively forming a Cuâ€”Caâ€”X film on the Cu interconnect line, wherein X denotes at least one contaminant, the Cuâ€”Caâ€”X film being processed by sputtering under an argon (Ar) atmosphere, thereby removing the at least one contaminant, and thereby effecting a thin Cuâ€”Ca film on the Cu interconnect line, the thin Cuâ€”Ca film being annealed, the thin Cuâ€”Ca film being alloyed, thereby forming a contaminant-reduced Cuâ€”Ca alloy surface on the Cu interconnect line, and thereby forming the. contaminant-reduced Cuâ€”Ca/Cu interconnect structure, comprising the contaminant-reduced Cuâ€”Ca alloy surface, on the semiconductor device.