Patent ID: 8415091

Claim:
A method for immersion lithography, comprising: forming a photo sensitive layer on a substrate, the photo sensitive layer including: a polymer that turns soluble to a base solution in response to reaction with acid; a plurality of photo-acid generators (PAGs) that decompose to form acid in response to radiation energy; and a plurality of quenchers capable of neutralizing acid and having a reduced mobility, wherein the quenchers include a structure selected from the group consisting of 1) two alkyl groups and a ring structure having an oxygen atom; 2) one alkyl group and two ring structures; and 3) three ring structures, and wherein at least one quencher from the plurality of quenchers is bonded to the polymer; exposing the photo sensitive layer in an immersion lithography system with an immersion fluid, the photo sensitive layer being able to leach the plurality of quenchers at a rate less than about 5×10 −13 mole /cm 2 into the immersion fluid; baking the photo sensitive layer; and developing the exposed photo sensitive layer.