Patent ID: 8088548

Claim:
An actinic radiation absorbing positive bottom photoimageable antireflective coating composition which is capable of being developed with an aqueous alkali developer and which is capable of being coated below a positive photoresist, wherein the antireflective coating composition comprises a polymer, a thermal acid generator, and a photoacid generator, where the photoacid generator is insoluble in a solvent of the photoresist, further where the photoacid generator is selected from a group consisting of (i) a photoacid generator where the cation is a monovalent cation with a volume of less than or equal to about 450 cubic angstroms, the anion is a divalent anion with a volume of less than or equal to about 205 cubic angstroms, and the photoacid generator has a melting point of at least 80° C.; (ii) a photoacid generator where the cation is a monovalent cation with a volume of less than or equal to about 450 cubic angstroms, the anion is a trivalent anion with a volume of less than or equal to about 220 cubic angstroms, and the photoacid generator has a melting point of at least 80° C.; (iii) a photoacid generator where the cation is a divalent cation with a volume of less than or equal to about 450 cubic angstroms, the anion is a monovalent anion with a volume of less than or equal to about 165 cubic angstroms, and the photoacid generator has a melting point of at least 130° C., and (iv) mixtures thereof.