Patent ID: 7709275

Claim:
A method of forming a pattern for a semiconductor device, comprising: providing a stacked structure, the stacked structure comprising a substrate, an etching target layer disposed on the substrate, a first hard mask disposed on the etching target layer, a second hard mask disposed on the first hard mask, a spin-on glass (SOG) layer disposed on the second hard mask, and a first patterned photoresist disposed on the SOG layer; performing a first etching process on the SOG layer by utilizing the first patterned photoresist as an etching mask so as to turn the SOG layer into an etched SOG layer; removing the first patterned photoresist; forming a second patterned photoresist on the etched SOG layer; performing a second etching process on the etched SOG layer by utilizing the second patterned photoresist as an etching mask so as to turn the etched SOG layer into a patterned SOG layer; removing the second patterned photoresist; etching the second hard mask by utilizing the patterned SOG layer as an etching mask so as to turn the second hard mask into an patterned second hard mask; and etching the first hard mask and the etching target layer by utilizing the patterned second hard mask as an etching mask.