Patent ID: 7264913

Claim:
An antireflective coating composition for a photoresist layer comprising a polymer, a crosslinking agent and an acid or/and acid generator, where the polymer comprises at least one unit selected from structure 1, 2 and 3, where, Y is a hydrocarbyl linking group of 1 to about 10 carbon atoms, R, R 1 , are independently hydrogen, hydrocarbyl group of 1 to about 10 carbon atoms, halogen, —O(CO)Z, —C(CF 3 ) 2 Z, —C(CF 3 ) 2 (CO)OZ, —SO 2 CF 3 , —(CO)OW, —SO 3 Z, —COZ, —OZ, —NZ 2 , —SZ, —SO 2 Z, —NHCOZ, —NZCOZ or —SO 2 NZ 2 , R′ and R″ are independently a hydrocarbyl group of 1 to about 10 carbon atoms, halogen, —O(CO)Z, —C(CF 3 ) 2 Z, —C(CF 3 ) 2 (CO)OZ, —SO 2 CF 3 , —SO 3 Z, —COZ, —OZ, —NZ 2 , —SZ, —SO 2 Z, —NHCOZ, —NZCOZ or —SO 2 NZ 2 , where Z is H or a hydrocarbyl group of 1 to about 10 carbon atoms, n=1–4, n′=1–4, X is O, CO, S, COO, CH 2 O, CH 2 COO, SO 2 , NH, NL, OWO, OW, or W, and where L and W are independently hydrocarbyl groups of 1 to about 10 carbon atoms, and m=0–3.