Patent ID: 8535872
Filing Date: 2013-09-17
Classification: G03F

Abstract:
1. An etch resistant thermally curable underlayer composition for use in a multilayer lithographic process, the composition comprising: (a) a polymer comprising repeating units of Structures I, II and III, the polymer comprising about 10 to about 35 mol % of Structure I, about 10 to about 55 mol % of Structure II, and about 25 to about 60 mol % of Structure III, wherein R 1 , R 2 , R 3 and R 4 individually are selected from the group consisting of a hydrogen atom, a halogen atom, a linear, branched or cyclic C 1 -C 10 alkyl group, a C 6 -C 20 aryl group, a halogenated or partially halogenated linear, branched or cyclic C 1 -C 10 alkyl group, and a polar group represented by (CH 2 ) n R 5 , with the proviso that R 2 and R 4 may be bonded to each other to form a bivalent group selected from the group consisting of —C(O)—Z—C(O)— and —(CH 2 ) p OC(O)—, wherein Z is selected from the group consisting of —O— and —N(R 13 )—, p is an integer from 1 to about 3 and R 13 is selected from the group consisting of a hydrogen atom and a C 1 -C 10 alkyl group; R 5 is selected from the group consisting of —OR 6 , —(OR 12 ) o OR 7 , —C(O)OR 8 , —C(O)(OR 12 ) o OR 9 or —OC(O)R 10 and n is an integer from 0 to 5; wherein R 6 , R 7 , R 8 , R 9 and R 10 each independently are selected from the group consisting of a hydrogen atom, a substituted or unsubstituted linear, branched or cyclic C 1 -C 20 alkyl group, and a substituted or unsubstituted C 6 -C 20 aryl group; R 12 is a C 2 -C 6 linear, branched or cyclic alkylene group; o is an integer from 1 to about 5; m is an integer from 0 to about 4; and X and Y are independently selected from the group consisting of —CH 2 —, —O—, and —S—; R 14 is selected from the group consisting of a hydrogen atom, a C 1 -C 3 alkyl group, a fully or partially halogen substituted C 1 -C 3 alkyl group, and a halogen atom; A is selected from the group consisting of a C 6 -C 20 arylene group and a A 1 -W-A 2 group wherein A 1 is a C 6 -C 10 arylene group, A 2 is a C 6 -C 10 aryl group and W is selected from the group consisting of a single bond, —S—, —O—, —C(O)—, —C(O)O—, —C(R 16 R 17 )—, —C(═CR 18 R 19 )— and —CR 18 ═CR 19 —, wherein R 16 , R 17 , R 18 and R 19 are independently selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a C 1 -C 10 alkyl group, and a partial or completely halogen substituted C 1 -C 10 alkyl group; R 15 is selected from the group consisting of a halogen atom, a linear, branched or cyclic C 1 -C 10 alkyl group, and a partial or complete halogen substituted C 1 -C 10 alkyl group; q is an integer from 1 to 2; and r is an integer from 0 to about 3; R 21 is selected from the group consisting of a hydrogen atom, a C 1 -C 3 alkyl group, and a halogen atom; L is selected from the group consisting of a single bond, a —C(O)O—, —C(O)O(R 23 O) s —, and a —C(O)NR 24 — group, wherein R 23 is a C 2 -C 6 alkylene group; R 24 is selected from the group consisting of a hydrogen atom and a linear, branched or cyclic C 1 -C 10 alkyl group; s is an integer from 1 to about 4; M is selected from the group consisting of a C 5 -C 20 cycloalkylene group and a C 6 -C 18 arylene group; E is selected from the group consisting of a single bond, —O—, —C(O)O—, —C(O)—, and —S(O 2 )—; R 22 is selected from the group consisting of a hydrogen atom, a substituted or unsubstituted linear, branched or cyclic C 1 -C 10 alkyl group, alicyclic C 5 -C 15 hydrocarbon group, a C 6 -C 18 aryl group, and a C 7 -C 18 alkylaryl group and t is an integer from 1 to about 4; with the proviso that when L is a single bond and M is an arylene group E-R 22 is not —OH; and with the proviso that none of the repeating units of Structure I or II or III contain acid sensitive groups; (b) at least one crosslinking agent; (c) at least one thermal acid generator; and (d) at least one solvent.