A sulfonium salt has formula (1) wherein R1 is a monovalent hydrocarbon group except vinyl and isopropenyl, R2, R3, and R4 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
硫鎓盐的
化学式为(1),其中R1是一种单价碳氢基团,除去
乙烯基和异
丙烯基,R2、R3和R4是烷基、烯基、氧代烷基、芳香基、芳香烷基或芳香氧代烷基,或者它们可以结合在一起形成与
硫原子相连的环,n为1至3。包含该
硫鎓盐的
化学增强型光刻胶组合物由于具有高分辨率、改善的焦点宽度、最小化的线宽变化和长时间暴露后的剖面降解,能够形成良好的细微结构图案。