Patent ID: 8053148

Claim:
A method for fabricating a photomask, the method comprising: forming a light blocking layer on a transparent substrate having a first region and a second region; forming a hard mask layer on the light blocking layer; forming a first polymer film on the hard mask layer, the first polymer film being formed of single strand polymers that can undergo complementary binding; changing the first polymer film in the first region to a second polymer film comprising polymers having partial complementary binding, thereby the second polymer film in the first region has a different etch rate than that of the first polymer film in the second region; forming a hard mask pattern for exposing a portion of the light blocking layer under the first polymer film in the second region by performing an etching process on the hard mask layer in the first region and the second region using the etch rate difference between the first polymer film in the second region and the second polymer film in the first region; forming a light blocking pattern by removing an exposed portion of the light blocking layer by performing an etching process using the hard mask pattern as an etch mask; and removing the hard mask pattern.