Patent ID: 9508719
Filing Date: 2016-11-29
CPC Classification: H01L

Claim Text:
1. A method for forming a semiconductor device structure, comprising: providing a substrate; forming a first fin structure and a second fin structure extending from the substrate by etching a portion of the substrate; forming a dielectric layer on the first fin structure and the second fin structure; forming a polysilicon layer, a hard mask layer and a photoresist layer on the dielectric layer; patterning the photoresist layer to form a first trench in the photoresist layer, wherein the first trench has a first width; conformally forming a coating layer in the first trench to form a second trench in the photoresist layer, wherein the second trench has a second width and the second width is smaller than the first width; patterning the hard mask layer by using the photoresist layer as a mask; patterning the polysilicon layer by using the hard mask as a mask to form an end-to-end gap between the first fin structure and a second fin structure, wherein the end-to-end gap has a third width, and the third width is smaller than the first width.