Patent ID: 8741548
Filing Date: 2014-06-03
Classification: G03F,H01L

Abstract:
1. A process for forming a pattern comprising the steps of: applying a first positive resist composition comprising a polymer as a base resin comprising recurring units having acid labile groups and recurring units having adhesive groups of hydroxy and/or lactone ring, an acid generator, and an organic solvent onto a substrate to form a first resist coating, heat treating the first resist coating, exposing to ArF excimer laser radiation, heat treating the exposed coating, developing the coating with a developer to form a first resist pattern, causing the first resist pattern to crosslink and cure by irradiation of high-energy radiation selected from the group consisting of Xe applying a second positive resist composition comprising a polymer onto the first resist pattern-bearing substrate to form a second resist coating, heat treating the second resist coating, exposing to high-energy radiation, heat treating the exposed coating, developing the second coating with a developer to form a second resist pattern; wherein the first positive resist composition comprises a polymer, an organic solvent, and an acid generator, said polymer comprising one or both of recurring units (a-1) and (a-2) of the general formula (1), and recurring units of the general formula (b): wherein R 1 and R 6 are each independently hydrogen, methyl or hydroxymethyl, R R R R a1, a2, and b are numbers in the range: 0≦a1<1.0, 0≦a2<1.0, 0<a1+a2<1.0, 0<b≦0.8, and 0.1 a1+a2+b≦1.0.