Patent ID: 7005248

Claim:
A method of forming a cavity between multilayered wirings, comprising: coating the surface of a first dielectric film formed on a semiconductor substrate with a polyamic acid and/or a polyimide obtained from at least one alicyclic tetracarboxylic acid dianhydride represented by the following general formula (1) and at least one alicyclic diamine represented by the following general formula (2): wherein R 1 represents a tetravalent alicyclic hydrocarbon group having 4–20 carbon atoms, the tetravalent alicyclic hydrocarbon group being able to contain a cyclic ether structure in the molecule, and H 2 N—R 2 —NH 2 (2) wherein R 2 represents a divalent alicyclic hydrocarbon group having 4–20 carbon atoms, patterning the polyamic acid and/or the polyimide as a cavity-forming polymer, embedding a metal in a pattern in the cavity-forming polymer to form a metallic wiring layer, forming a second dielectric film on the cavity-forming polymer containing the embedded metal, and removing the cavity-forming polymer present in the wiring layer by heating to form a cavity.