Patent ID: 7482107
Filing Date: 2009-01-27
Classification: G03F,Y10S

Abstract:
1. A positive working photoresist composition comprising an alkali soluble resin substituted with an acid labile blocking group that requires an activation energy of at least 20 Kcal/mol for deblocking, a base and a photoacid generating compound that undergoes photolysis when exposed to a pattern of activating radiation at a wavelength of 350 mn or less to yield a sulfonic acid having a strong electron withdrawing group and a pK a that does not exceed 0, the photoacid generator is one capable of generating an acid of a formula: where R is an alkyl having from 1 to 18 carbon atoms or aryl, X is a strong electron withdrawing group, and a is a whole number from 1 to 18; the base has a formula N(R′ where x is from about 10 to 90 percent, y is from about 1 to 75 percent, and z is from 1 to 75 percent of the mole fraction, the hydroxyl group on the hydroxystyrene may be present at either the ortho, meta, or para positions throughout the copolymer, R′