申请人:Shin-Etsu Chemical Co., Ltd.
公开号:EP2146247A1
公开(公告)日:2010-01-20
There is disclosed a resist patterning process with a minimum line width of 65 nanometers or less may be formed by using a resist composition containing a polymer, as a base polymer of a chemically-amplified resist composition, composed of a styrene unit whose hydroxyl group is protected by an acid labile group, and an indene unit, and/or an acenaphthalene unit, wherein the polymer has the weight-average molecular weight of 4,000 to 7,000, and in particular, 4,500 to 5,500.One of the currently existing problems to be solved is the line edge roughness. To solve this problem by an acid-generator and a basic compound, there is a problem of the trade-off relationship with a resolution power. There can be provided a resist composition having a high resolution containing a base polymer such as hydroxystyrene that is protected by an acid labile group, a resist patterning process with a pattern rule of 65 nanometers or less having a reduced line edge roughness.
本发明公开了一种抗蚀剂图案化工艺,其最小线宽为 65 纳米或更小,方法是使用一种抗蚀剂组合物,该抗蚀剂组合物含有一种聚合物,作为化学扩增抗蚀剂组合物的基体聚合物,该聚合物由苯乙烯单元(其羟基被一个耐酸基团保护)、茚单元和/或苊单元组成,其中该聚合物的重量平均分子量为 4,000 至 7,000,特别是 4,500 至 5,500。目前有待解决的问题之一是线边缘粗糙度。要通过酸性发生剂和碱性化合物来解决这个问题,就存在一个与分辨力的权衡关系问题。现在可以提供一种具有高分辨率的抗蚀剂组合物,它含有一种被酸性基团保护的碱聚合物(如羟基苯乙烯),这种抗蚀剂图案化工艺的图案规则为 65 纳米或更小,具有较低的线边缘粗糙度。