Patent ID: 6770528
Filing Date: 2004-08-03
Classification: H01L

Abstract:
A method of manufacturing a semiconductor integrated circuit device having at least one memory cell composed of a cell-selecting MISFET formed in a major surface of a semiconductor substrate and a data-storing capacitive element provided above the cell-selecting MISFET, said method comprising the steps of:(a) forming the cell-selecting MISFET on a surface of a semiconductor substrate, forming a first insulating film on the cell-selecting MISFET, and forming, in a through hole made in the first insulating film, a first conductive film electrically connected to a source or drain of the cell-selecting MISFET; (b) forming a second insulating film on the first insulating film and making a trench in the second insulating film; (c) forming a second conductive film in the trench and on the second insulating film, said second conductive film extending through the trench and electrically connected to the first conductive film; (d) convering the second conductive film with a photoresist film and applying exposure light to the photoresist film, thereby exposing a part of the photoresist film which lies outside the trench to light; (e) removing the part of the photoresist film which has been exposed to light, thereby leaving, in the trench, the other part of the photoresist film which is not exposed to light; (f) removing a part of the second conductive film which is not covered with said other part of the photoresist film, thereby leaving the other part of the second conductive film in the trench; and (g) removing said other part of the photoresist film that lies in the trench, and then forming a third insulating film in the trench and on the remaining second insulating film and forming a third conductive film on the third insulating film, thereby forming the data-storing capacitive element composed of a first electrode, a capacitive insulating film and a second electrode which are said made of said remaining second conductive film, said third insulating film and said third conductive film, respectively.