Patent ID: 7416976
Filing Date: 2008-08-26
Classification: H01L

Abstract:
1. A method for forming a semiconductor product, the method comprising: providing a substrate having a substrate surface; forming wordlines arranged at a distance from one another and running along a first direction parallel to the substrate surface; forming auxiliary structures between the wordlines, the auxiliary structures filling spaces between the wordlines above the substrate surface and having a top side and a bottom side, a distance between the top side and the substrate surface being larger than a distance between the bottom side and the substrate surface; patterning the auxiliary structures thereby forming trenches extending through the auxiliary structures from the top sides to the bottom sides, in each auxiliary structure plural trenches being formed, which trenches are arranged at a distance from one another along the first direction, the trenches having a width along the first direction being larger at the top side of the auxiliary structures than at the bottom side of the auxiliary structures; filling the trenches formed in the auxiliary structures with filling structures; removing the auxiliary structures by etching, thereby exposing sidewalls of the filling structures; and forming conductive contact structures for contacting the substrate surface in between the filling structures, the contact structures having a top side provided at a distance from the substrate surface, the contact structures extending to the substrate surface and having a width at the substrate surface, which width along the first direction is larger than a width of the top sides of the contact structures along the first direction.