Patent ID: 7157349
Filing Date: 2007-01-02
Classification: H01L

Abstract:
1. A method of manufacturing a semiconductor device, the method comprising: applying an auxiliary layer comprising non-doped silicon and germanium to a surface of a silicon body wherein, during an oxidation treatment, a thicker layer of silicon oxide is formed on the auxiliary layer than is formed on the surface of the silicon body; at the location of field isolation regions to be formed, forming windows in the auxiliary layer and grooves in the surface of the silicon body; carrying out an oxidation treatment to provide the walls of the grooves and of the windows respectively of the silicon body and the auxiliary layer with a layer of silicon oxide, the silicon oxide on the auxiliary layer being thicker than the silicon oxide on the silicon body; but wherein it is precluded that the auxiliary layer adjacent to the windows is oxidized across the entire thickness; after which, successively, a layer of isolating material is deposited in a thickness such that the grooves and the windows arc filled completely; and carrying out a planarization treatment until the non-oxidized part of the auxiliary layer is exposed, after which this part of the auxiliary layer is removed.