Patent ID: 8518530

Claim:
A method of preparing an ultralow dielectric film, comprising: putting a compound represented by the following Formula 1 and a poly alkyl silsesquioxane copolymer into an organic solvent to prepare a mixed solution and then coating the mixed solution on a substrate to form a thin film; heating the thin film to 200 to 300° C.; and subjecting the thin film to heat treatment after raising the thin film to 350 to 500° C. and irradiating an ultraviolet (UV) ray at a wavelength of 200 to 300 nm onto the thin film for 5 to 30 min during the heat treatment: R 1 OCH 2 [CH(OR 2 )] n CH 2 OR 3 [Formula 1] wherein R 1 , R 2 , and R 3 are each hydrogen or A, and one or more of R 1 , R 2 , and R 3 are A, wherein, A is R 4 Si(OR 5 ) 3 , R 4 and R 5 are each an alkyl group of a carbon number of 1 to 5, and n is an integer of 2 to 4.