Patent ID: 7718505
Filing Date: 2010-05-18
Classification: H01L

Abstract:
1. A method of forming a semiconductor structure in a substrate, comprising: forming a first trench with a first width W.sub.e and a second trench with a second width W.sub.c (I), wherein the first width W.sub.e is larger than the second width W.sub.c; depositing a protection material (III), lining the first trench, covering the substrate surface and filling the second trench; removing partially the protection material (IV), wherein a lower portion of the second trench remains filled with the protection material; forming a first insulating layer (II) and a first auxiliary layer (III) thereon, both lining the first and the second trench and covering the substrate surface; processing the semiconductor structure (V; VI), wherein the first insulating layer remains in the lower portion of the second trench; forming a second insulating layer (VI), lining the first trench and an upper portion of the second trench and covering the substrate surface; depositing the second auxiliary layer (VIII), lining the first and the second trench and covering the substrate surface; structuring the semiconductor structure (IX), wherein the second trench and at least a part of the substrate surface remains lined respectively covered with the second auxiliary layer; and forming a third insulating layer (XI), lining the first trench and at least another part of the substrate surface; wherein the processing of the semiconductor structure comprises: