公开(公告)号：US06207353B1

公开(公告)日：2001-03-27

申请号：US08987808

申请日：1997-12-10

申请人： Michael D. Armacost ,  Willard E. Conley ,  Tina J. Cotler-Wagner ,  Ronald A. DellaGuardia ,  David M. Dobuzinsky ,  Michael L. Passow ,  William C. Wille

发明人： Michael D. Armacost ,  Willard E. Conley ,  Tina J. Cotler-Wagner ,  Ronald A. DellaGuardia ,  David M. Dobuzinsky ,  Michael L. Passow ,  William C. Wille

IPC分类号： G03F700

CPC分类号： H01L21/0274 ,  G03F7/039 ,  H01L21/31116 ,  H01L21/31144

摘要： A resist formulation minimizes blistering during reactive ion etching processes resulting in an increased amount of polymer by-product deposition. Such processes involve exciting a gaseous fluorocarbon etchant with sufficient energy to form a high-density plasma, and the use of an etchant having a carbon-to-fluorine ratio of at least 0.33. In addition to a conventional photoactive component, resists which minimize blistering under these conditions include a resin binder which is a terpolymer having: (a) units that contain acid-labile groups; (b) units that are free of reactive groups and hydroxyl groups; and (c) units that contribute to aqueous developability of the photoresist. After the photoresist is patterned on the silicon oxide layer and the high-density plasma is formed, the high-density plasma is introduced to the silicon oxide layer to etch at least one opening in the silicon oxide layer. Preferably, the terpolymer is made up of about 70% 4-hydroxystyrene, about 20% styrene, and about 10% t-butylacrylate.

摘要翻译： 抗蚀剂制剂使反应离子蚀刻过程中的起泡最小化，导致聚合物副产物沉积量增加。 这种方法包括以足够的能量激发气态碳氟化合物蚀刻剂以形成高密度等离子体，以及使用碳 - 氟比至少为0.33的蚀刻剂。 除了常规的光活性组分之外，在这些条件下使泡沫最小化的抗蚀剂包括具有以下三元共聚物的树脂粘合剂：（a）含有酸不稳定基团的单元; （b）不含反应性基团和羟基的单元; 和（c）有助于光致抗蚀剂的水性显影性的单元。 在氧化硅层上形成光致抗蚀剂并形成高密度等离子体之后，将高密度等离子体引入到氧化硅层中以蚀刻氧化硅层中的至少一个开口。 优选地，三元共聚物由约70％的4-羟基苯乙烯，约20％的苯乙烯和约10％的丙烯酸叔丁酯组成。