Patent ID: 7655576

Claim:
A method for manufacturing a semiconductor device, comprising forming an insulator film comprising a material having Si—CH 3 bond and Si—OH bond over a substrate, irradiating said insulator film with ultraviolet rays under a condition of generating Si—CH 2 —CH 2 —Si bond and Si—CH 2 —Si bond by ultraviolet ray irradiation in the insulator film so that a modified insulator film is formed from said insulator film, wherein said irradiating of the ultraviolet rays is done through a filter, and wherein the ultraviolet rays that have passed through the filter have a cumulative illumination intensity in the longer wavelength range not shorter than 320 nm that is not more than 136% of a cumulative illumination intensity in the wavelength range not longer than 320 nm, and the ultraviolet rays have at least one peak in the range not longer than 320 nm.