Patent ID: 6881998
Filing Date: 2005-04-19
Classification: H01L

Abstract:
1. A semiconductor device comprising: a semiconductor substrate including an active region and an isolating region formed so as to enclose the active region; a capacitance insulating film that is formed on the active region and has a boundary portion in contact with the isolating region; an upper electrode provided on the capacitance insulating film so as to be spaced away from the isolating region; an electrode pad formed on the isolating region; a lead conductive film provided over a part of the capacitance insulating film and a part of the isolating region for connecting the upper electrode and the electrode pad; and an interlayer insulating film provided over the substrate, wherein contact holes penetrating the interlayer insulating film to reach the electrode pad are formed, the active region in contact with the boundary portion includes a region containing impurities having an oxidation enhanced diffusion effect, and the capacitance insulating film is formed by oxidizing the active region and has a larger thickness in the boundary portion than in other portions.