Patent ID: 7670759

Claim:
A method of forming a micro pattern comprising steps of: (a) coating photosensitive resist material over a substrate and exposing and developing the photosensitive resist material to form a resist pattern; (b) etching a surface layer of sidewalls and a top wall of the resist pattern by plasma of a mixture gas comprising a first gas and an SO 2 gas, the first gas comprising at least one gas selected from the group consisting of He, Ne, Ar, Xe, Kr, CO, CO 2 and N 2 ; wherein in the step (b), a flow rate of the first gas is equal to or larger than 40% of a flow rate of the mixture gas; wherein the substrate has an antireflection film made of organic substance and formed over an underlying surface; in the step (b), the surface layer of the resist pattern is etched, and by using the resist pattern, whose surface layer is being etched, as a mask, the antireflection film is etched to be patterned; and wherein a partial area of the underlying surface is covered with the antireflection film patterned in the step (b), and the underlying surface exposed and not covered with the antireflection film patterned in the step (b) is larger than a surface of the antireflection film exposed and not covered with the resist pattern after the step (a) and before the step (b).