Photoacid generators generate sulfonic acids of formula (
1
a) upon exposure to high-energy radiation.
ROC(═O)R
1
—COOCH
2
CF
2
SO
3
−
H
+
(1a)
RO is OH or C
1
-C
20
organoxy, R
1
is a divalent C
1
-C
20
aliphatic group or forms a cyclic structure with RO. The photoacid generators are compatible with resins and can control acid diffusion and are thus suited for use in chemically amplified resist compositions.
光酸发生剂在高能辐射作用下生成式(1a)的
磺酸。
ROC(═O)R1—COOCH2
CF2SO3−H+(1a)
RO为OH或C1-C20有机氧基,R1为二价的C1-C20脂肪族基团或与RO形成环状结构。这些光酸发生剂与
树脂相容,可以控制酸的扩散,因此适用于
化学增感抗蚀组合物的使用。