Patent ID: 6998351

Claim:
A method for forming a micro pattern, comprising the steps of: (a) providing a semiconductor substrate on which a lower film is formed using an organic anti-reflection coating of amorphous carbon series or an inorganic anti-reflection coating; (b) coating a first photoresist film on the lower film; (c) depositing a second photoresist film having a higher glass transition temperature than the first photoresist film on the first photoresist film; (d) patterning the second photoresist film and the first photoresist film by an exposure process and a wet development process so that first and second photoresist film pattern having a first contact hole are formed; (e) implementing RFP to cause the first and second photoresist film pattern to flow so that the first contact hole changes to a second contact hole having a critical dimension lower than a critical dimension of the first contact hole; and (f) implementing an etch process using the second photoresist film pattern as an etch mask for the lower film to pattern the lower film.