Patent ID: 6876080

Claim:
A double layered copper connector comprising: a partially completed integrated circuit, including a top surface with an electrical contact region; on said top surface, a first insulating layer, having an upper and a lower surface, said lower surface being in contact with said integrated circuit; a first dual damascene copper connector, comprising a first trench part and a first stud part, in the first insulating layer extending from the upper surface of said first insulating layer towards said electrical contact region; a second insulating layer having an upper and a lower surface, on the upper surface of the first insulating layer; a second dual damascene copper connector, comprising a second trench part and a second stud part, in the second insulating layer, extending from the upper surface of said second insulating layer towards the upper surface of said first insulating layer; and a compound barrier structure comprising: a lower barrier layer, said lower barrier layer being substantially flat, having a center portion between said first trench part and said second stud part; and having a side portion between said first and second insulating layers; a middle barrier layer formed in said second insulating layer, having a lower portion surrounding said second stud part, and having a substantially flat top portion; and an upper barrier layer surrounding said second stud part and said second trench part, said upper barrier layer having a lower portion between said second stud part and said lower portion of said middle barrier layer, and having an upper portion above said substantially flat top portion of said middle barrier layer, wherein said substantially flat top layer of said middle barrier layer has a width greater than a width of said upper portion of said upper barrier layer.