Patent ID: 8354339

Claim:
A method of fabricating a self-aligned permanent on-chip interconnect structure comprising: forming a patterned photoresist having at least one opening on a surface of a substrate; forming a dielectric sidewall structure on each sidewall of said patterned photoresist and within said at least one opening, wherein a narrowed width opening is located between neighboring dielectric sidewall structures, and wherein said forming the dielectric sidewall structure includes overfilling the at least one opening with a dielectric coating material, baking to cause diffusion of residual acid from sidewalls of the patterned photoresist into neighboring sidewall portions of the dielectric coating material and crosslinking of said neighboring sidewall portions of the dielectric coating material, and removing non-crosslinked portions of the dielectric coating material relative to the crosslinked neighboring sidewall portions of the dielectric coating material; removing the patterned photoresist to provide additional openings between neighboring dielectric structures; and converting each dielectric sidewall structure to form a self-aligned double patterned permanent dielectric structure.