Patent ID: 9122164
Filing Date: 2015-09-01
Classification: G03F

Abstract:
1. A method for forming a resist pattern, comprising: forming an immersion lithography resist layer over a substrate, wherein the immersion lithography resist layer comprises a matrix polymer having a first molecular weight and a first polarity and a perfluorocarbon surfactant having a second molecular weight and a second polarity, the perfluorocarbon surfactant including at least one selected from a group consisting of: perfluorohexane; perfluorodecane; perfluorocycloether; perfluoro-2-butyltetrahydrofuran; perfluorotripropylamine; a mixture of perfluorotri-n-butylamine and perfluoro-n-dibutylmethylamine; perfluorotributylamine; and perfluorotripentylamine, wherein a difference in the first and second polarities and a difference in the first and second molecular weights cause the perfluorocarbon surfactant to diffuse to a top surface of the immersion lithography resist layer, and wherein the at least one selected perfluorocarbon surfactant is hydrophobic and increases a water resistance of the immersion lithography resist layer; exposing the immersion lithography resist layer with an immersion lithography exposure tool; baking the immersion lithography resist layer; developing the immersion lithography resist layer to form the resist pattern; and rinsing the substrate and resist pattern in a fluorine-containing liquid, wherein the fluorine-containing liquid includes at least one selected from a group consisting of: perfluorohexane; perfluorodecane; perfluorocycloether; perfluoro-2-butyltetrahydrofuran; perfluorotripropylamine; a mixture of perfluorotri-n-butylamine and perfluoro-n-dibutylmethylamine; perfluorotributylamine; and perfluorotripentylamine.