A positive resist composition capable of improving the occurrence of standing waves on the side walls of a resist pattern, and a method of forming a resist pattern that uses such a positive resist composition. The positive resist composition comprises a resin component (A) that displays improved alkali solubility under the action of acid, and a photoacid generator component (B) that generates acid on exposure, wherein the component (A) comprises a structural unit (a1) derived from hydroxystyrene, and a structural unit (a2) derived from a (meth)acrylate ester represented by a general formula (I) shown below, and the component (B) comprises a diazomethane based photoacid generator as the primary component.
一种能够改善抗蚀剂图案侧壁驻波发生的正向抗蚀剂组合物,以及一种使用这种正向抗蚀剂组合物形成抗蚀剂图案的方法。该正抗蚀剂组合物包括在酸作用下显示出更好的碱溶解性的
树脂成分(A)和在曝光时产生酸的光酸发生器成分(B),其中成分(A)包括衍生自羟基
苯乙烯的结构单元(a1)和衍生自如下所示通式(I)代表的(甲基)
丙烯酸酯的结构单元(a2),成分(B)包括作为主要成分的
重氮甲烷基光酸发生器。