A sulfonium salt of a naphthyltetrahydrothiophenium cation having a fluoroalkoxy chain with a specific anion is provided. The sulfonium salt is used as a photoacid generator to form a resist composition which when processed by immersion lithography, offers advantages of restrained dissolution in the immersion water and less pattern dependence or dark/bright bias.
提供了一种具有氟烷氧链的
萘基
四氢噻吩阳离子的
磺酸盐,具有特定阴离子。该
磺酸盐用作光酸发生剂,形成抗蚀剂组合物,当通过浸没光刻法处理时,提供了在浸没
水中受抑制的溶解和更少的图案依赖性或暗/亮偏差的优点。