Patent ID: 6670236
Filing Date: 2003-12-30
Classification: H01L

Abstract:
A method of producing a semiconductor device having a capacitance element on a first conductive-type semiconductor substrate, comprising:forming a pad oxide film, a first silicon layer and an oxidation resisting film on an element formation area of the semiconductor substrate; forming an element separation film by thermal oxidation; removing only the oxidation resisting film wherein the pad oxide film and the first silicon layer are left in the element formation area; forming a second conductive-type impurity layer on a surface of the semiconductor substrate by ion implantation passing through the pad oxide film and the first silicon layer; and forming a second silicon layer, wherein the first and the second silicon layers comprise an upper electrode of the capacitance element, the pad oxide film comprises a capacitance insulation film, and the second conductive-type impurity layer comprises a lower electrode of the capacitance element.