Patent ID: 6307251
Filing Date: 2001-10-23
Classification: H01L

Abstract:
A semiconductor device having a capacitance element, comprising:an element isolation film formed so as to surround an element formation area on a first conductive-type semiconductor substrate;a second conductive-type impurity layer formed on a surface of the element formation area;a capacitance insulation film formed of a pad oxide film formed on the second conductive-type impurity layer;a first silicon layer including a pad-silicon layer formed on the capacitance insulation film; anda second silicon layer, which is formed on the first silicon layer and extends on the element isolation film;wherein the first and the second silicon layers are an upper electrode of the capacitance element, the impurity layer is a lower electrode of the capacitance element, and the second silicon layer extends on the element isolation film but the first silicon layer does not.