Patent ID: 8524569
Filing Date: 2013-09-03
Classification: H01L

Abstract:
1. A method of forming an isolation layer, comprising: forming a first trench and a second trench at upper portions of a substrate, the first and the second trenches having first and second widths, respectively, and the second width being greater than the first width; forming a first isolation layer pattern filling the first trench; forming a second isolation layer pattern partially filling the second trench; and forming a third isolation layer pattern on the second isolation layer pattern and filling a remaining portion of the second trench; wherein forming the first and the second trenches on the substrate comprises: forming a plurality of first structures and a plurality of second structures on the substrate; wherein forming the second isolation layer pattern comprises: forming a first insulation layer on the substrate, the first structures and the second structures, the first insulation layer filling the first and the second trenches, a first space between the first structures, and a second space between the second structures; planarizing an upper portion of the first insulation layer using the first and the second structures as a planarization endpoint to form a first insulation layer pattern and a second insulation layer pattern, the first insulation layer pattern being formed between the first structures and in the first trench, and the second insulation layer pattern being formed between the second structures and in the second trench; and removing the first insulation layer pattern and an upper portion of the second insulation layer pattern; wherein forming the first insulation layer comprises: forming the first insulation layer having a void therein to partially fill the first trench and the first space between the first structures.