Antireflective composition for photoresists

1. An antireflective coating composition for a photoresist layer comprising a polymer, a crosslinking agent and an acid generator, where the polymer comprises at least one unit of structure 1,

where, X is a linking moiety selected from a nonaromatic (A) moiety, aromatic (P) moiety and mixture thereof, R′ is a group of structure 2, where R 1 and R 2 are H and L is a fluorinated alkyl, and further where structure 2 is

derived by capping a carboxyl group with fluorinated glycidyl ether capping reactant,

R″ is independently selected from hydrogen or a group of structure 2, where R 1 and R 2 are hydrogen and L is a fluorinated alkyl, and further where structure 2 is derived by capping a carboxyl group with fluorinated glycidyl ether capping reactant and, Y′ is independently a (C 1 -C 20 ) hydrocarbylene linking moiety.

2. The composition of claim 1 , where A is selected from a group consisting of C 1 -C 20 unsubstituted alkylene, C 1 -C 20 substituted alkylene, C 1 -C 20 unsubstituted cycloaliphatic, C 1 -C 20 substituted cycloaliphatic, and C 1 -C 20 unsubstituted heterocycloaliphatic, and C 1 -C 20 substituted heterocycloaliphatic moiety.

3. The composition of claim 1 , where the polymer is of Structure 3,

where, B is a single bond or C 1 -C 6 nonaromatic aliphatic moiety, R′ is a group of structure 2, where R 1 and R 2 are hydrogen, and L is a fluorinated alkyl, and further where structure 2 is derived by capping a carboxyl group with fluorinated glycidyl ether capping reactant and R″ is independently selected from hydrogen or a group of structure 2, where R 1 and R 2 are hydrogen, and L is a fluorinated alkyl, and further where structure 2 is derived by capping a carboxyl group with fluorinated glycidyl ether capping reactant, and Y′ is independently a (C 1 -C 20 ) hydrocarbylene linking moiety.

4. The composition of claim 1 where Y′ is selected from a group consisting of methylene, ethylene, propylene, butylene, phenylethylene, alkylnitroalkylene, neopentylene, alkylenearylate, dithiaoctylene, bromonitroalkylene, phenylene, naphthylene, anthracylene, derivatives of phenylene, derivatives of naphthylene, and derivatives of anthracylene.

5. The composition of claim 1 , where Y′ is selected from a group consisting of 1-phenyl-1,2-ethylene, neopentylene, ethylenephenylate, 2-bromo-2-nitro-1,3-propylene, 2-bromo-2-methyl-1,3-propylene, polyethyleneglycol, 1-phenylate-1 ,2-ethylene, 1-benzylate-1 ,2-ethylene, —CH 2 OCH 2 —, —CH 2 CH 2 OCH 2 CH 2 —, —CH 2 CH 2 SCH 2 CH 2 —, —CH 2 CH 2 SCH 2 CH 2 SCH 2 CH 2 —, propylenephenyl acetate, 2-propylenephenyl acetate (—CH 2 CH 2 (CH 2 CO 2 CH 2 Ph), propylene phenyl ether (—CH 2 CH 2 (CH 2 OPh), propylene phenolate (—CH 2 CH 2 (CH 2 CO 2 Ph), propylene naphthoate, propylenephthalimide, propylenesuccinimide, and propylene crotylidene acetate (—CH 2 CH 2 (CH 2 CO 2 CHCHCHCHCH 3 ).

6. The composition of claim 1 , where the crosslinking agent is selected from a group consisting of melamines, methylols, glycolurils, polymeric glycolurils, hydroxy alkyl amides, epoxy and epoxy amine resins, blocked isocyanates, and divinyl monomers.

7. The composition of claim 1 , where the acid generator is a thermal acid generator and is selected from a group consisting of alkyl ammonium salts of organic acids, phenolic sulfonate esters, nitrobenzyl tosylates, metal-free iodonium and metal-free sulfonium salts.

8. The composition of claim 1 , where R′ is a group of structure 2, where R 1 and R 2 are hydrogen and L is a fluorinated alkyl, and further where structure 2 is derived by capping a carboxyl group with capping reactant selected from a group consisting of glycidyl 1,1,2,2-tetrafluoroethyl ether, glycidyl 2,2,3,3-tetrafluoropropyl ether, and glycidyl 2,2,3,3,4,4,5,5-octafluoropentyl ether, and R″ is independently selected from hydrogen or a group of structure (2), where R 1 and R 2 are hydrogen and L is a fluorinated alkyl, and further where structure 2 is derived by capping a carboxyl group with capping reactant selected from a group consisting of glycidyl 1,1,2,2-tetrafluoroethyl ether, glycidyl 2,2,3,3-tetrafluoropropyl ether, and glycidyl 2,2,3,3,4,4,5,5-octafluoropentyl ether.

9. An article comprising a substrate with a layer of antireflective coating composition of claim 1 and thereon a coating of photoresist comprising a polymer and a photoactive compound.

10. A process for forming an image comprising,

a) coating and baking a substrate with the antireflective coating composition of claim 1 ;

b) coating and baking a photoresist film on top of the antireflective coating;

c) imagewise exposing the photoresist to radiation;

d) developing an image in the photoresist;

e) optionally, baking the substrate after the exposing step.

11. The process of claim 10 , where the photoresist is imagewise exposed at wavelengths between 130 nm to 250 nm.

12. The process of claim 10 , where the photoresist comprises a polymer and a photoactive compound.

13. The process of claim 10 , where the antireflective coating is baked at temperatures greater than 90° C.

14. The composition of claim 1 , where the polymer is partially crosslinked polymer.

15. The composition of claim 1 where R′ and R″ are groups derived by capping a carboxyl group with a fluorinated glycidyl ether capping reactant selected from the group consisting of glycidyl 1,1,2,2-tetrafluoroethyl ether, glycidyl 2,2,3,3-tetrafluoropropyl ether, and glycidyl 2,2,3,3,4,4,5,5-octafluoropentyl ether.