Patent ID: 7799511

Claim:
A method for forming a contact hole, comprising: providing a substrate to form an etching stop layer, 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 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; forming a second photo resist pattern on said silicon-containing photo resist layer; performing a second etching procedure on said silicon-containing photo resist layer to form a plurality of second openings by using said second photo resist pattern as an etching mask, wherein said first openings and said second openings are not overlapped; and performing an etching procedure to form said contact holes in said interlayer dielectric layer and said etching stop layer by using said silicon-containing photo resist layer with said first and said second openings as an etching mask.