Patent ID: 6716763
Filing Date: 2004-04-06
Classification: G03F,H01L

Abstract:
A method for etching a substrate, comprising:providing a substrate having an oxide layer over a silicon layer, and an antireflective layer over said oxide layer, forming a photoresist layer over said antireflective layer; patterning said photoresist layer in a manner which exposes portions of said antireflective layer; placing said substrate into a reactive chamber; introducing into said chamber an etching gas; generating a plasma of said etching gas at a first power level and contacting said photoresist layer of said substrate with said first power level plasma for a first predetermined time; and, generating a plasma of said etching gas at a second power level in said chamber and contacting said substrate with said second power level plasma for a second predetermined time to etch said exposed portions of said antireflective layer, wherein said first and second power levels are different.