Patent ID: 8168374
Filing Date: 2012-05-01
Classification: H01L

Abstract:
1. A method for forming a contact hole, comprising: providing a substrate to form an interlayer dielectric layer and a first silicon-containing photo resist layer thereon sequentially; forming a first photo resist pattern on said first silicon-containing photo resist layer; performing a first etching procedure on said first silicon-containing photo resist layer to form a plurality of first openings by using said first photo resist pattern as an etching mask; removing said first photo resist pattern; performing an etching procedure to form a plurality of first contact holes in said interlayer dielectric layer by using said first openings as an etching mask and removing said first silicon-containing photo resist layer; forming a second silicon-containing photo resist layer on said interlayer dielectric layer; forming a second photo resist pattern on said second silicon-containing photo resist layer; and performing an etching procedure to form a plurality of second contact holes in said interlayer dielectric layer by using said second photo resist pattern as an etching mask.