Patent ID: 6846899

Claim:
A dual damascene method comprising: (a) providing a substrate in which a conductive layer has been formed; (b) forming sequentially a stack of layers on said substrate including a passivation layer at the bottom of said stack followed by a dielectric layer, a first etch stop layer, a second dielectric layer and a second etch stop or cap layer in which one or more layers in said stack is comprised of a poly(arylene ether) comprising the structure; wherein n=5 to 10000; and monovalent radical Ar 1 and divalent radical Ar 2 are heteroaromatic groups that incorporate O, N, Se, S, or Te or combinations of the aforesaid elements; (c) forming a via hole and a trench in said stack of layers, said via hole is aligned above said conductive layer and said trench is above said via hole; and (d) depositing a barrier metal layer and a metal layer within said via and trench followed by planarizing said metal layer to be coplanar with the top of said stack.