Provided herein are hardmask compositions for resist underlayer films, wherein according to some embodiments of the invention, hardmask compositions include a polymer prepared by the reaction of a compound of Formula 1 with a compound of Formula 2 (R)m—Si—(OCH3)4-m  (2) in the presence of a catalyst, wherein R is a monovalent organic group, n is an integer from 3 to 20, and m is 1 or 2; and an organic solvent. Also provided herein are methods for producing a semiconductor integrated circuit device using a hardmask composition according to an embodiment of the invention. Further provided are semiconductor integrated circuit devices produced by a method embodiment of the invention.