Sulfonate salts and derivatives, photoacid generators, resist compositions, and patterning process
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:US07556909B2
公开(公告)日:2009-07-07
Sulfonate salts have the formula: CF3—CH(OH)—CF2SO3−M+ wherein M+ is a Li, Na, K, ammonium or tetramethylammonium ion. Because of inclusion within the molecule of a hydroxyl group which is a polar group, the sulfonic acids are effective for restraining the length of acid diffusion through hydrogen bond or the like. The photoacid generators that generate these sulfonic acids perform well during the device fabrication process including coating, pre-baking, exposure, post-exposure baking, and developing steps. The photoacid generators are little affected by water left on the wafer during the ArF immersion lithography.
磺酸盐的化学式为:CF3—CH(OH)—CF2SO3−M+,其中M+可以是锂、钠、钾、铵或四甲基铵离子。由于分子中包含一个极性羟基,磺酸具有通过氢键等方式抑制酸扩散长度的效果。生成这些磺酸的光酸发生剂在器件制造过程中,包括涂覆、预烘、曝光、后烘和显影步骤中表现良好。在ArF浸没光刻过程中,这些光酸发生剂受到残留在晶圆上的水的影响较小。