Patent ID: 7901848

Claim:
A method of fabricating a photomask, the method comprising: forming a light blocking layer over a transparent substrate; forming first and second hard mask patterns over the light blocking layer, the first and second hard mask patterns having a same first width, and an opening between the first and second hard mask patterns having a second width that is three times the first width; forming a self assembly molecule (SAM) layer having a length of the first width over the sides of the first and second hard mask patterns, the SAM layer exposing a first width of the light blocking layer; forming a resist layer pattern having the first width of the light blocking layer over the light blocking layer exposed by the SAM layer; removing the SAM layer to expose the light blocking layer covered by the SAM layer; etching the exposed portion of the light blocking layer to form a light blocking layer pattern; and, removing the first and second hard mask patterns and the resist layer pattern.