Patent ID: 7432194
Filing Date: 2008-10-07
Classification: H01L

Abstract:
1. An etching method, comprising: providing a semiconductor substrate, on which a dielectric layer, an anti-reflection coating (ARC) and a patterned photoresist layer are formed sequentially; conducting a first etching step, with the patterned photoresist layer as a mask, to remove at least the ARC exposed by the patterned photoresist layer, wherein a temperature of the first etching step is about 0-30° C. and a polymer spacer is formed on a sidewall of the patterned photoresist layer in the first etching step; conducting a second etching step, with the patterned photoresist layer as a mask, to remove a portion of the dielectric layer; and removing the patterned photoresist layer, wherein the first and second etching steps are conducted at different temperatures.