Patent ID: 7867834
Filing Date: 2011-01-11
Classification: H01L

Abstract:
1. A manufacturing method of a semiconductor device comprising: etching a semiconductor substrate to form a first trench and a semiconductor projection having a first width, wherein the semiconductor projection is made from the semiconductor substrate, wherein the semiconductor projection is formed by etching the semiconductor substrate to a first depth, and wherein a second trench for a device isolation area is formed after forming the semiconductor projection by etching in a region of the semiconductor substrate spaced apart from the bottom of the semiconductor projection; forming a conformal oxide film on the substrate, including on the second trench and the semiconductor projection; forming an insulating layer on the oxide film; exposing an upper surface of the semiconductor projection by polishing the insulating layer and the oxide film; forming a gate insulating layer at a lower region of the semiconductor projection; and etching the insulating layer and the oxide film to expose a bottom of the first trench between the second trench and the semiconductor projection.