Patent ID: 8367310
Filing Date: 2013-02-05
Classification: G03F

Abstract:
1. A process for forming a pattern, comprising the steps of: (1) coating a first positive resist composition comprising a polymer comprising recurring units adapted to increase alkali solubility under the action of acid and recurring units having lactone structure onto a substrate and baking to form a first resist film, exposing the first resist film to high-energy radiation, post-exposure baking, and developing the first resist film with an alkaline developer to form a first resist pattern composed mainly of lines, (2) applying a resist-modifying composition to the first resist pattern and heating to modify the first resist pattern, (3) coating a second positive resist composition onto the modified first resist pattern and baking to form a second resist film, exposing the second resist film to high-energy radiation, post-exposure baking, and developing the second resist film with an alkaline developer to form a second resist pattern composed mainly of lines parallel to the first resist pattern, for thereby reducing the distance between resist pattern lines, the first resist pattern in the unexposed area resulting from modifying step (2) having a contact angle with pure water of 50 to 85 degrees; wherein said resist-modifying composition comprises a base resin which is soluble in alkaline developer and non-soluble in water, the base resin having a fluorine atom content of 15 to 55% by weight, a nitrogen-containing organic compound, and a solvent; wherein the base resin comprises recurring units having the general formula (1) or (2): wherein A wherein said resist-modifying composition comprises an aminosilane compound as the nitrogen-containing organic compound.