Patent ID: 6897502
Filing Date: 2005-05-24
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate; a first trench formed in a surface of the semiconductor substrate and having a first side wall; a first impurity diffusion area formed in the semiconductor substrate at a bottom of the first trench; a second impurity diffusion area formed in the surface of the semiconductor substrate, having one end in contact with the first side wall, and having the same conductive type as that of the first impurity diffusion area; a first gate electrode provided on the first side wall between the first impurity diffusion area and second impurity diffusion area with a gate insulating film interposed therebetween; a first lower electrode provided on the second impurity diffusion area; a first ferroelectric film provided on the first lower electrode; a first upper electrode provided on the first ferroelectric film; a first interconnection layer provided above the first upper electrode; and a first contact plug partly provided in the first trench and electrically connecting the first interconnection layer and first impurity diffusion area.