Patent ID: 7470625
Filing Date: 2008-12-30
Classification: G03F,H01L

Abstract:
1. A method for plasma etching a silicon substrate, comprising: providing a silicon substrate having an oxide layer, an antireflective coating, and at least one patterned photoresist element formed over the silicon substrate; placing said substrate into a reactive chamber; generating a low power plasma of an etching gas in said chamber at about 100-200 Watts; contacting said at least one patterned photoresist element with said low power plasma to stabilize said at least one patterned photoresist element; generating a first high power plasma of an etching gas in said chamber at about 800-1100 Watts; contacting exposed portions of said antireflective coating exposed through said patterned photoresist element with said first high power plasma of said etching gas; generating a second high power plasma of an etching gas in said chamber; and contacting said oxide layer with said second high power plasma of said etching gas.