Patent ID: 7026093

Claim:
A positive working photoresist composition comprising an alkali soluble resin substituted with a acid labile blocking group that requires an activation energy of at least 20 Kcal/mol for deblocking, and a photoacid generating compound that undergoes photolysis when exposed to a pattern of activating radiation at a wavelength of 350 nm 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 has 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 alkali soluble resin has a formula: 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 11 is substituted or unsubstituted alkyl having 1 to 10 carbon atoms, R 1 and R 2 are independently halogen, substituted or unsubstituted alkyl having from 1 to 8 carbon atoms, substituted or unsubstituted alkoxy having from 1 to 8 carbon atoms, substituted or unsubstituted alkenyl having 2 to 8 carbons atoms, substituted or unsubstituted alkylthio having from 1 to 8 carbon atoms, cyano, and nitro; and m is an integer of 0 to 5 and p is an integer of 0 to 4; and R 3 , R 4 , and R 5 are hydrogen or substituted or unsubstituted alkyl.