A positive resist composition comprising (A) a polymer comprising recurring units of a specific structure adapted to generate an acid in response to high-energy radiation and acid labile units, the polymer having an alkali solubility that increases under the action of an acid, and (B) a sulfonium salt of a specific structure exhibits a high resolution in forming fine size patterns, typically trench patterns and hole patterns. Lithographic properties of profile, DOF and roughness are improved.
一种正性光阻组合物,包括(A)一种聚合物,其中包含适于在高能辐射作用下产生酸和酸不稳定单元的特定结构的重复单元,该聚合物具有碱溶性,在酸的作用下碱溶性增加,以及(B)一种特定结构的
磺酸盐,能够在形成细小尺寸图案,通常是沟槽和孔图案时,表现出高分辨率。轮廓、深度焦点和粗糙度的光刻特性得到改善。