Patent ID: 8133805

Claim:
A method comprising: forming an opening in an inter-layer dielectric (ILD) on a wafer, wherein the opening includes a sidewall surface and a bottom surface; and exposing the opening to a plurality of substantially parallel ultra-violet (UV) radiation rays to form a dense dielectric layer having a substantially uniform thickness over both the sidewall surface and the bottom surface, wherein the exposing comprises: exposing the bottom surface to the plurality of substantially parallel UV radiation rays at a first angle of incidence; and exposing the sidewall surface to the plurality of substantially parallel UV radiation rays at a second angle of incidence different than the first angle of incidence, wherein the second angle of incidence is based on dimensions of the opening and is equal to an angle that provides exposure to the sidewall surface without exposing the bottom surface, such that the exposure to the bottom surface and the sidewall surface is substantially uniform, and wherein exposing the sidewall surface includes positioning the wafer at an angle relative to the plurality of substantially parallel UV radiation rays equal to approximately the second angle of incidence.