Patent ID: 9653546
Date: 2017-05-16
CPC Classifications: B82Y,H01L

Claim:
1. A manufacturing method of a nanowire structure, comprising: forming a fin and a shallow trench isolation (STI) on a substrate, wherein the STI surrounds the fin, an upper part of the fin is exposed from the STI, the fin comprises a first region and two second regions, and the first region is disposed between the two second regions; forming a first patterned insulation layer on the exposed upper part of the fin; recessing the STI for exposing a lower part of the fin; forming a second patterned insulation layer on the second regions of the fin, wherein the second patterned insulation layer covers the first patterned insulation layer and the exposed part of the fin in the second region, and the second patterned insulation layer does not cover the first region; removing the exposed lower part of the fin for forming an upper fin and a lower fin in the first region; wherein a gap is formed between the upper fin and the lower fin in a vertical projective direction, and the first patterned insulation layer covers a top surface of the first region of the fin in the step of removing the exposed lower part of the fin; further recessing the STI is for exposing a portion of the lower fin and a portion of the fin in the second regions; removing the first patterned insulation layer on the first region; and converting the upper fin into a first nanowire.