A photo-oxidation generated low-k dielectric film deposited by reactive evaporation of SiO
A non-stoichiometric silicon oxide film has been deposited by evaporating SiO as a source material in Ar and O2 mixed gas. The film is composed of SiO and SiO2, and has a porous structure. The SiO2 results from some part of SiO reacting with O2 and its amount depends on the pressure in the chamber. The residual SiO in the film can be photo-oxidized into SiO2 by ultraviolet radiation with a Hg lamp. The dielectric constant of the film after photo-oxidation is ?1.890.04 (at frequency of 1 MHz), which shows that this porous structure film is promising for potential application as a low-k dielectric.
photo-oxidation low-k dielectric silicon oxide reactive deposition porous film