Patent ID: 7358589
Filing Date: 2008-04-15
Classification: H01L,Y10S

Abstract:
1. A metal-to-metal antifuse in an integrated circuit comprising: a portion of a first metal interconnect layer in the integrated circuit; a first insulating layer formed over the first metal interconnect layer; a lower electrode formed from a conductive plug formed in an aperture in the insulating layer and in electrical contact with the first metal interconnect layer, the conductive plug; a lower adhesion promoting layer disposed over the lower electrode, the lower adhesion promoting layer being without substantial affect on electrical characteristics of the antifuse; an amorphous carbon antifuse material layer disposed over the lower adhesion promoting layer; an upper adhesion promoting layer disposed over the antifuse material layer, the upper adhesion promoting layer being without substantial affect on electrical characteristics of the antifuse; a barrier layer formed over the upper adhesion promoting layer; a conductive hardmask layer formed over the barrier layer; the lower adhesion promoting layer, the amorphous carbon antifuse material layer, the upper adhesion promoting layer, the barrier layer, and the conductive hardmask layer arranged as a stack; a second insulating layer formed around and over the lower adhesion promoting layer, the amorphous carbon antifuse material layer, the upper adhesion promoting layer, the barrier layer, and the conductive hardmask layer, the second insulating layer including an upper electrode aperture formed therein to expose an upper surface of the conductive hardmask layer; an upper metal electrode formed from a portion of a second metal interconnect layer and disposed over the second insulating layer, a portion of the upper metal electrode disposed in the upper electrode aperture and in contact with an upper surface of the conductive hardmask layer; wherein the lower adhesion promoting layer and the upper adhesion promoting layer are selected from a group of materials comprising Si