Patent ID: 6331481
Filing Date: 2001-12-18
Classification: H01L

Abstract:
A method of providing a low dielectric constant material to a damascene structure containing an intermetal dielectric having planarized in-laid wiring comprising the steps of:(a) partially etching back an intermetal dielectric of a damascene structure having planarized in-laid wiring, said intermetal dielectric is formed on an etch stop layer that includes openings in which said planarized in-laid wiring is in electrical contact with wiring regions of a lower wiring level, so as to expose a portion of said in-laid wiring, wherein said etching back is stopped before reaching said etch stop layer;(b) forming a dielectric material having a dielectric constant lower than SiO.sub.2 and the intermetal dielectric on said partially etched intermetal dielectric; and(c) planarizing the structure provided in step (b).