Patent ID: 7316943
Filing Date: 2008-01-08
Classification: H01L

Abstract:
1. A method for manufacturing a semiconductor apparatus, comprising: forming a first semiconductor layer on a semiconductor substrate; etching and removing a part of the first semiconductor layer sandwiched by a source formation region and a drain formation region to form a groove section in which a surface of the semiconductor substrate is exposed in the first semiconductor layer; forming a second semiconductor layer having an etching selectivity smaller than that of the first semiconductor layer on the semiconductor substrate so that the groove section is filled and the surface of the first semiconductor layer is covered; sequentially etching and removing the second semiconductor layer exterior to a transistor formation region and the first semiconductor layer exterior to the transistor formation region to expose an end section of the first semiconductor layer along the periphery of the transistor formation region, wherein the sequentially etching and removing being stopped on a top surface of the semiconductor layer; etching and removing the first semiconductor layer from the exposed end section to form a cavity section under the second semiconductor layer of the transistor formation region; and forming a buried oxide film in the cavity section.