A sulfonium salt has formula (1) wherein R
1
is a monovalent hydrocarbon group except vinyl and isopropenyl, R
2
, R
3
, and R
4
are alkyl, alkenyl, oxoalkyl, aryl, aralkyl or aryloxoalkyl or may bond together to form a ring with the sulfur atom, and n is 1 to 3. A chemically amplified resist composition comprising the sulfonium salt is capable of forming a fine feature pattern of good profile after development due to high resolution, improved focal latitude, and minimized line width variation and profile degradation upon prolonged PED.
一种
硫铵盐的
化学式为(1),其中R1是一种一价碳氢基团,但不包括
乙烯基和异
丙烯基,R2、R3和R4是烷基、烯基、氧代烷基、芳基、芳基烷基或芳基氧代烷基,或者它们可以相互连接形成与
硫原子的环,并且n为1至3。包含该
硫铵盐的
化学增感抗剂组合物能够由于高分辨率、改善的焦距宽度、以及在长时间PED后最小化线宽变化和剖面降解而形成良好剖面的精细特征图案。