Patent ID: 8791027

Claim:
A method of manufacturing a semiconductor device comprising steps of a plasma process performed on a semiconductor substrate having an insulating film and a mask formed on the insulating film and made of an organic material, the plasma process comprising: a first step of generating a stress to an organic material comprising a first photoresist film and an antireflection film so as to form a second photoresist film and a patterned antireflection film, said second photoresist film and patterned antireflection film having a second pattern shrinking the first pattern using a gas containing a rare gas without containing any of fluorine, oxygen, and nitrogen; a second step of relaxing the stress from the second photoresist film and the patterned antireflection film using a gas containing a rare gas without containing any of fluorine, oxygen, and nitrogen; and etching the insulating film using the second photoresist film and the patterned antireflection film as a mask, wherein the first step and the second step are alternately repeated, and wherein the first step is a performed for a time of 2 seconds or longer and 15 seconds or shorter.