Patent ID: 6914316
Filing Date: 2005-07-05
Classification: H01L

Abstract:
1. A trench structure of a semiconductor device comprising: a first region of a substrate having a first trench, the first trench having a first aspect ratio; a first filling element having a first insulation material continuously formed on a bottom face and sidewalls of the first trench, and a second insulation material completely filling a first sub-trench formed in the first trench by the formation of the first insulation material; a second region of the substrate having a second trench, the second trench having a second aspect ratio smaller than the first aspect ratio; and a second filling element having a third insulation material continuously formed on a bottom face and sidewalls of the second trench, a fourth insulation material formed on a bottom face and sidewalls of a second sub-trench formed in the second trench by the formation of the third insulation material, and a fifth insulation material completely filling a third sub-trench formed in the second sub-trench by the formation of the fourth insulation material.