Abstract:
A method for manufacturing a semiconductor device includes: (i) depositing a sacrificial layer made of an organic polymer such as benzocyclobutene on a substrate having a circuit formed thereon; (ii) etching the sacrificial layer except for a portion where air gaps are to be formed; (iii) depositing a low-dielectric layer over the substrate until the portion for air gaps is entirely enclosed in the low-dielectric layer; (iv) etching the low-dielectric layer to form via holes and trenches there through; (v) prior or subsequent to step (iv), removing the portion for air gaps; and (vi) depositing copper in the vias and trenches which are filled with the copper contacting a surface of the substrate.
Abstract:
An insulation film is formed on a semiconductor substrate by vaporizing a silicon-containing hydrocarbon compound to provide a source gas, introducing a reaction gas composed of the source gas and an additive gas such as an inert gas and oxidizing gas to a reaction space of a plasma CVD apparatus. The silicon-containing hydrocarbon compound includes a cyclosiloxan compound or a linear siloxan compound, as a basal structure, with reactive groups for form oligomers using the basal structure. The residence time of the reaction gas in the reaction space is lengthened by reducing the total flow of the reaction gas in such a way as to form a siloxan polymer film with a. low dielectric constant.