Patent ID: 7122297

Claim:
A method for fabricating a patterned substrate, which comprises the steps of: applying a resist composition to a substrate, exposing the resist composition which has been applied, developing the exposed resist composition, and etching the substrate to which the developed resist composition has been applied, wherein the resist composition contains (a) a photosensitive resin composition containing a hydroxyalkyl cellulose derivative having a sugar structure which has a hydroxyalkyl group in a side chain, (b) a photo acid generator generating an acid by radiation of an electromagnetic wave or a charged particle beam and (c) a solvent for dissolving the photosensitive resin composition, wherein the hydroxyalkyl cellulose derivative has a hydroxypropyl cellulose structure represented by formula (2): wherein each of R 4 , R 5 , and R 6 represents hydrogen or the following structure (3): or wherein OZ represents a hydroxyl group or a substitutional group which is capable of generating a hydroxyl group when cleaved by the acid and at least one of R 4 , R 5 or R 6 is one of the structure (3) in which OZ is a substitutional group capable of generating a hydroxyl group when cleaved by the acid.