Patent ID: 7459763
Filing Date: 2008-12-02
Classification: G11C,H01L

Abstract:
1. A reprogrammable metal-to-metal antifuse comprising: an inter-metal dielectric layer having a via formed therethrough and filled with a metal plug; a lower Ti barrier layer disposed over said metal plug; a lower adhesion-promoting layer disposed over said lower Ti barrier layer; an antifuse material layer disposed above an upper surface of said lower adhesion-promoting layer, said antifuse material layer selected from a group comprising at least one of amorphous carbon and amorphous carbon doped with at least one of hydrogen and fluorine disposed over said lower adhesion-promoting layer; an upper adhesion-promoting layer disposed over said antifuse material layer; and an upper Ti barrier layer disposed over said upper adhesion-promoting layer, wherein: said lower adhesion-promoting layer and said upper adhesion-promoting layer each have a thickness of between about 2 angstroms and about 20 angstroms; the reprogrammable metal-to-metal antifuse is programmed in response to a programming potential applied across the antifuse; and the reprogrammable metal-to-metal antifuse is erased in response to an erasing potential, lower in magnitude than the programming potential, across the antifuse.