Patent ID: 9034557
Filing Date: 2015-05-19
Classification: G03F

Abstract:
1. A photoresist composition, comprising: one or more resin binders that include one or more acid sensitive protecting groups and that are substantially free of phenolic groups protected by acetal or ketal groups and wherein the binder becomes alkali-soluble by the action of an acid to remove the acid sensitive protecting groups; one or more photo acid generators, that, upon exposure to a source of high energy, decompose and generate a photoacid strong enough to remove the one or more acid sensitive groups; one or more ionic non-photosensitive additives of an iminium salt; and one or more solvents, wherein the iminium salt is selected from the group consisting of a salt of structure I wherein B a salt of the structure: wherein W is a carbon atom, X is a selected from the group consisting of a R 6 C group, a nitrogen atom, and oxygen atom and a sulfur atom, Y is selected from the group consisting of a (R 7 ) 2 C, a carbonyl group, an S atom and an O atom, Z is selected from the group consisting of a (R 8 ) 2 C group, a R 9 N, an S atom and an O atom, R 1 to R 9 are each independently selected from the group consisting of a hydrogen atom, C 1 -C 3 carbon chain and a 5 to 7 member ring, R 1 and R 2 may be connected together to form a 5-7 member ring, R 3 and R 4 may form a 5-7 member ring if connected together, A − is selected from the group consisting of an organic sulfonic acid anion (R 11 SO 3 − ), a sulfamic acid anion [R 12 N(R 13 )SO 3 − ], a carboxylic acid anion (R 14 CO 2 − ), an alkyl sulfate anion (R 15 SO 4 − ), a bis sulfonyl imide anion [(R 16 SO 2 ) 2 N − ], and a tris sulfonyl methide anion [(R 16 SO 2 ) 3 C − ]; where R 11 , R 12 , R 13 , R 14 and R 15 are each independently selected from the group consisting of a C 1 -C 24 carbon chain, a partially or fully halogen substituted carbon chain, unsubstituted or substituted C 6 -C 20 aromatic carbon group, and combinations thereof, optionally containing S or N or any organic functional group that may interrupt the skeletal chain; R 16 is independently selected from the group consisting of highly fluorinated or perfluorinated alkyl and fluorinated aryl groups and may be cyclic, when a combination of any two R 16 groups are linked to form a bridge, further, the R 16 alkyl chains contain from 1-20 carbon atoms and may be straight, branched, or cyclic, such that divalent oxygen, trivalent nitrogen or hexavalent sulfur may interrupt the skeletal chain, and further when R 16 contains a cyclic structure, such structure has 5 or 6 ring members, optionally, 1 or 2 of which are N, S or O atoms, and a salt of the structure: wherein W is a carbon atom, X is selected from the group consisting of a R 26 C group and a nitrogen atom, Y is selected from the group consisting of a (R 27 ) 2 C, a carbonyl group, an S atom and an O atom, Z is selected from the group consisting of a (R 28 ) 2 C group, a R 29 N group, an S atom and an O atom, R 21 to R 27 and R 29 are each independently selected from the group consisting of a hydrogen atom, a phenyl group, and a C 1 -C 3 carbon chain optionally substituted with a phenyl group or a 5 to 7 member ring, R 21 and R 22 may be connected together to form a 5-7 member ring, R 23 and R 24 may form a 5-7 member ring if connected together, p and s are each independently 0 or 1, and q and t are each independently 1, R 28 is selected from the group consisting of a hydrogen atom and a C 1 -C 3 carbon chain optionally substituted with a phenyl group or a 5 to 7 member ring; and A − is selected from the group consisting of an organic sulfonic acid anion (R 11 SO 3 − ), a sulfamic acid anion [R 12 N(R 13 )SO 3 − ]a carboxylic acid anion (R 14 CO 2 − ), an alkyl sulfate anion (R 15 SO 4 − ), a bis sulfonyl imide anion [(R 16 SO 2 ) 2 N − ], and a tris sulfonyl methide anion [(R 16 SO 2 ) 3 C − ].