A photoacid generator represented by the following formula (1), a method for producing the photoacid generator, and a resist composition containing the photoacid generator are provided.
wherein in the formula (1), Y, X, R1, R2, n1, n2 and A+ have the same meanings as defined in the detailed description of the invention. The photoacid generator can maintain an appropriate contact angle at the time of ArF liquid immersion lithography, can reduce defects occurring during liquid immersion lithography, and has excellent solubility in resist solvents and excellent compatibility with resins. Furthermore, the photoacid generator can be produced by an efficient and simple method using an epoxy compound that is industrially easily available.
本发明提供了一种由以下式子(1)所代表的光酸发生剂、制备该光酸发生剂的方法以及含有该光酸发生剂的抗蚀剂组合物。在式(1)中,Y、X、R1、R2、n1、n2和A+的含义与本发明详细说明中定义的含义相同。该光酸发生剂在ArF液体浸没光刻时可以保持适当的接触角,可以减少液体浸没光刻时发生的缺陷,并且在抗蚀剂溶剂中具有优异的溶解性和与
树脂的优异相容性。此外,该光酸发生剂可以通过使用工业上易得的环氧化合物进行高效简单的方法制备。