Patent ID: 6576400
Filing Date: 2003-06-10
Classification: G03F,Y10S

Abstract:
A method of pattern formation on a substrate, comprising:coating on the substrate a positive-working composition sensitive to electron beams or X-rays, comprising one or the other, or both, of the following components (1) and (2): (1) a polymer A, the solubility of which is increased in aqueous alkali solution by the action of acid, (2) an alkali-soluble polymer B and a compound C which has the effect of suppressing the alkali solubility of said polymer B and the suppression effect of which is lowered or eliminated by the action of acid, and further comprising a component (3), which is a compound which generates acid by irradiation with electron beams or X-rays, wherein the ease of main chain scission of said polymer A or B by electron beams or X-rays is greater than that of polymethyl methacrylate; drying the coated composition; subjecting the dried composition to a pattern exposure using electron beams or X-rays; developing the exposed composition to form the pattern on the substrate.