Patent ID: 6509262
Filing Date: 2003-01-21
Classification: H01L

Abstract:
A method of fabricating a semiconductor device having a contaminant-reduced copper-calcium alloy on copper (Cuâ€”Ca/Cu) interconnect line structure formed in a via for reducing electromigration therein, comprising:a. providing a semiconductor substrate having the via; b. depositing a copper (Cu) interconnect line in the via; c. treating the Cu interconnect line in a chemical 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; d. processing the Cuâ€”Caâ€”X film 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; 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 interconnect line, and thereby forming the contaminant-reduced Cuâ€”Ca/Cu interconnect line structure, comprising the contaminant-reduced Cuâ€”Ca alloy surface on the semiconductor substrate; and f. completing formation of the semiconductor device.