Patent ID: 6118152
Filing Date: 2000-09-12
Classification: H01L

Abstract:
A semiconductor device comprising:a substrate;a first impurity diffused semiconductor layer disposed on the substrate;a buried oxide film disposed on the first impurity diffused semiconductor layer;a semiconductor island disposed on the buried oxide film and surrounded by a trench, the trench extending to the first impurity diffused semiconductor layer;a side wall oxide film disposed on a side wall of the trench to cover the semiconductor island exposed on the side wall;a semiconductor element provided in the semiconductor island;a second impurity diffused semiconductor layer filling the trench to communicate with the first impurity diffused semiconductor layer underlying the semiconductor island, and electrically insulated from the semiconductor island by the side wall oxide film and by the buried oxide film; anda potential applying electrode disposed on the second impurity diffused semiconductor layer, for applying an electric potential to the first and second impurity diffused semiconductor layers.