This invention provides a composition containing an organometallic compound having a chromophore moiety in the metal polymer backbone which allows a wider range of n/k values such that substrate reflectivity can be controlled under various conditions.
1. A method comprising: providing a substrate; coating a film of the composition comprising: an organometallic compound of the formula
wherein R 2 ═(C 1 -C 20 )hydrocarbyl; M 1 is a Group 3 to Group 14 metal; G=R 3 b -Ch-R 3 b or Ch(OM 1 L 1 m OR 2 ) c ; Ch=a chromophore moiety; R 3 is a divalent linking group having from 1 to 12 carbon atoms; R 4 ═H, R 2 or M(L 1 ) m OR 2 ; L 1 is a ligand; m refers to the number of ligands and is an integer from 1-4; a=an integer from 1 to 20; each b is independently an integer from 0 to 25; c=1 or 2; and an organic solvent on a surface of the substrate; curing the film under conditions sufficient to form a metal hardmask layer comprising the chromophore moiety; disposing a layer of a photoresist on the cured metal hardmask layer; and exposing the photoresist by to patterned radiation to form an image.
2. The method of claim 1 wherein M 1 is chosen from titanium, zirconium, hafnium, tungsten, tantalum, molybdenum, vanadium, indium, germanium, gallium, thallium, and aluminum.
3. The method of claim 1 wherein each L 1 is chosen from (C 1 -C 20 )alkoxy, (C 2 -C 20 )carboxyl, beta-diketonates, beta-hydroxyketonates, beta-ketoesters, beta-diketiminates, amindinates, guanidinates, or beta-hydroxyiminates.
4. The method of claim 1 wherein the chromophore moiety comprises one or more of an aromatic ring or an isocyanurate.
5. The method of claim 4 wherein the aromatic ring is chosen from phenyl, naphthyl, anthracenyl, or phenanthryl.
6. The method of claim 1 wherein the chromophore is an isocyanurate.
7. The method of claim 1 wherein the composition further comprises a surface treating polymer having a surface energy of 20 to 40 erg/cm 2 and comprising a surface treating moiety chosen from hydroxyl, protected hydroxyl, protected carboxyl, or mixtures thereof.
8. The method of claim 1 wherein R 3 comprises one or more atoms selected from the group consisting of oxygen, nitrogen, and sulfur.
9. The method of claim 1 wherein R 3 is selected from the group consisting of (C 2 -C 12 )alkylene-O— and (C 2 -C 12 )alkylidene-O—.
10. The method of claim 1 wherein G is chosen from Ch, Ch-R 3 b , R a b -Ch, or Ch(OM 1 L 1 m OR 2 ) c .
11. The method of claim 1 wherein the chromophore moiety is substituted with one or more substituents selected from the group consisting of (C 1 -C 6 )alkyl, cyano, halo, nitro and SO 3 —Y, where Y═H, ammonium or an alkali metal ion.