Onium salts of arylsulfonyloxybenzenesulfonate anions with iodonium or sulfonium cations are novel. A chemically amplified resist composition comprising the onium salt as a photoacid generator is suited for microfabrication, especially by deep UV lithography because of many advantages including improved resolution, improved focal latitude, minimized line width variation or shape degradation even on long-term PED, minimized debris after coating, development and peeling, and improved pattern profile after development.
芳基
磺酸氧
苯磺酸盐的离子与
碘化铵或亚砜
铵阳离子的醇盐是新颖的。包含这种醇盐作为光酸发生剂的
化学增强型光阻组合物适用于微细加工,特别是深紫外光刻,因为具有许多优点,包括改善分辨率,改善焦点纬度,即使在长期PED时也最小化线宽变化或形状退化,涂层、开发和剥离后最小化碎屑,以及开发后改善图案轮廓。