Patent ID: 8426111

Claim:
A method for forming an underlayer coating used as an underlayer of a photoresist in a lithography process for the manufacture of semiconductor devices, comprising: forming a flattening coating on a semiconductor substrate prior to applying an underlayer coating forming composition on the semiconductor substrate, applying the underlayer coating forming composition on the semiconductor substrate to form an applied coating, and irradiating the applied coating with light to form an underlayer coating; wherein: the underlayer coating forming composition comprises a polymerizable compound and a photo-cationic polymerization initiator, wherein: the polymerizable compound is a polymer compound of formula (1): or formula (2): P in formula (1) and formula (2) is an ethylene group, a propylene group, a derivative of an alkylene group substituted with a benzene ring, an organic group derived from an aliphatic cyclic compound, or a derivative of the organic group derived from the aliphatic cyclic compound substituted with an alkyl group or a halogen atom, and Q in formula (1) and formula (2) is a direct bond or a divalent organic group having an ester bond, an ether bond, or an amide bond that links the epoxy ring of formula (1) or the oxetane ring of formula (2) to the P group constituting a polymer backbone; and the light irradiation is carried out with light having a wavelength of 193 nm to 700 nm.