Patent ID: 6207342
Filing Date: 2001-03-27
Classification: G03F,Y10S

Abstract:
A chemically amplified resist material which comprises:I. an acid-sensitive terpolymer produced upon copolymerization of(i) a first monomer unit having a structure which contains an alkali-soluble group protected with an alicyclic hydrocarbon-containing protective group and in which structure said alkali-soluble group is cleaved with an acid to thereby permit said terpolymer to exhibit a solubility in an alkaline solution,(ii) a second monomer unit having a lactone structure, and(iii) a third monomer unit having a structure which contains an alkali-soluble group protected with a protective group different from that of said first monomer unit and in which structure said alkali-soluble group is cleaved with an acid to thereby permit said terpolymer to exhibit a solubility in an alkaline solution,said second monomer unit being contained in an amount of 10 to 35% by mole based on a total amount of said terpolymer; andII. a photoacid generator capable of producing an acid upon exposure to a patterning radiation.