Patent ID: 8450045
Filing Date: 2013-05-28
Classification: G03F

Abstract:
1. A pattern forming method comprising: providing and curing a under-layer film containing a radiation-sensitive acid generator which generates an acid upon exposure to radiation on a substrate; irradiating the under-layer film with radiation through a mask to cause an acid to be selectively generated in an exposed area of the under-layer film; providing an upper-layer film which does not contain a radiation-sensitive acid generator and which contains a composition capable of polymerizing or crosslinking by an action of an acid; providing a cured film by polymerization or crosslinking selectively in an area of the upper-layer film corresponding to the exposed area of the under-layer film in which the acid has been generated; and removing an area of the upper-layer film corresponding to an area of the under-layer film in which the acid has not been generated, wherein the upper-layer film contains a polymer having at least one repeating unit shown by the following formulas (3), (4A), and (4B) and has a polystyrene-reduced weight average molecular weight measured by a gel-permeation chromatography method of 500 to 500,000, wherein each of R