Patent ID: 8349533

Claim:
A resist lower-layer composition configured to be used by a multi-layer resist method used in lithography to form a layer lower than a photoresist layer acting as a resist upper layer film, wherein the lower layer obtained by coating and baking the resist lower-layer composition is insoluble or poorly-soluble in an alkaline developer, and wherein the resist lower-layer composition comprises, at least, a thermal acid generator represented by the general formula (3) for generating an acid represented by the general formula (1) by heating at a temperature of 100° C. or higher: RCOO—CH 2 CF 2 SO 3 − H + (1) wherein, R represents any one of methyl group, ethyl group, n-propyl group, sec-propyl group, cyclopropyl group, n-butyl group, sec-butyl group, iso-butyl group, tert-butyl group, n-pentyl group, cyclopentyl group, n-hexyl group, cyclohexyl group, n-octyl group, n-decyl group, n-dodecyl group, 1-adamantyl group, 2-adamantyl group, bicycle[2.2.1]hepten-2-yl group, phenyl group, 4-methoxyphenyl group, 4-tert-butylphenyl group, 4-biphenyl group, 1-naphthyl group, 2-naphthyl group, 10-anthranyl group, 2-furanyl group, 4-oxo-cyclohexyl group, and following groups: wherein, a broken line in the formula represents a bond hands, RCOO—CH 2 CF 2 SO 3 − (R 1 ) 4 N + (3) wherein, R represents the same meaning as before; and R 1 's mutually independently represent a hydrogen atom, a substituted or unsubstituted linear, branched, or cyclic alkyl group, alkenyl group, or oxoalkyl group having 1 to 10 carbon atoms, or a substituted or unsubstituted aryl group, aralkyl group, or aryloxoalkyl group having 6 to 18 carbon atoms, or alternatively, two or more of R 1 's may be mutually bonded to form a ring together with N in the formula.