Patent ID: 9666687
Date: 2017-05-30
CPC Classifications: H01L

Claim:
1. A method for forming a semiconductor structure, at least comprising: forming four sacrificial patterns on a substrate; forming four annular-shaped spacers on the sidewalls of the four sacrificial patterns respectively, wherein a star-shaped region is defined between the four annular-shaped structures; removing the four sacrificial patterns; forming a photoresist layer among each of the four annular-shaped spacers, covering parts of each of the four annular-shaped spacers, wherein the photoresist layer entirely covers the star-shaped region; performing a first etching process, to partially remove each of the four annular-shaped spacers; removing the photoresist layer; and performing a second etching process, to remove each of the four annular-shaped spacers again, and to form four nanowire hard masks.