Patent ID: 6809398
Filing Date: 2004-10-26
Classification: H01L,Y10S

Abstract:
A metal-to-metal antifuse formed over a planarized surface formed from a metal layer and the top surface of a lower insulating layer, comprising:a first cap layer covering the planarized surface; a first barrier metal layer forming an antifuse electrode disposed in a via in said cap layer over and in electrical contact with said metal layer, said via being narrower than said metal layer, said first barrier metal layer having an upper surface planarized with an upper surface of said cap layer; a layer of antifuse material disposed over said first barrier metal layer and having edges extending over said cap layer; a second barrier metal layer disposed over said antifuse material layer and having edges aligned with said edges of said antifuse material layer; a second cap layer disposed over said first cap layer and surrounding said antifuse material and said second barrier metal layer; an intermetal dielectric layer formed over said second cap layer; and a metal contact formed in a via in said intermetal dielectric layer and said second cap layer, said metal contact in electrical contact with said second barrier layer.