Patent ID: 8343694
Filing Date: 2013-01-01
Classification: G03F

Abstract:
1. A process for forming a resist pattern using a workpiece having a resist film deposited thereon, said resist film comprising (A) a base resin which is insoluble in an aqueous alkaline solution, but turns to be soluble in an aqueous alkaline developer under the action of an acid, (B) an acid generator, (C) a basic compound, and (D) a polymer comprising first recurring units having a side chain having a first fluorinated hydrocarbon group bearing a hydroxyl group which contains the carbon atom to which the hydroxyl group is bonded and vicinal carbon atoms bonded thereto, the vicinal carbon atoms having in total at least two fluorine atoms bonded thereto, wherein the base resin (A) comprises recurring units having an aromatic structure, the polymer (D) functions such that the contact angle with neutral water of a resist film comprising components (A) to (D) is larger than the contact angle of a resist film comprising components (A) to (C) and free of component (D), the first recurring units of the polymer (D) have the general formula (1) or (2): wherein R 1 and R 2 are each independently hydrogen or a straight, branched or cyclic C 1 -C 6 alkyl group, or R 1 and R 2 may bond together to form a ring, a combination of R 1 and R 2 standing for a divalent organic group of 2 to 12 carbon atoms in total, R R X the polymer (D) further comprises second recurring units having a side chain having a second fluorinated hydrocarbon group different from the first fluorinated hydrocarbon group and free of the first fluorinated hydrocarbon group, the second recurring units of the polymer (D) have the general formula (3): wherein R the polymer (D) further comprises another recurring unit different from the first and second recurring units, in an amount of up to 20 mol % based on the entire recurring units of the polymer (D), and the resist film contains 0.1 to 10 parts by weight of the polymer (D) per 100 parts by weight of the component (A), said process comprising the steps of irradiating high-energy radiation to the resist film in the absence of a liquid, and developing the resist film with an aqueous alkaline developer.