Patent ID: 7531863
Filing Date: 2009-05-12
Classification: H01L

Abstract:
1. A semiconductor device comprising: a protective insulating film deposited on a semiconductor substrate having first and second field-effect transistors formed thereon; a capacitor composed of a capacitor lower electrode, a capacitor insulating film made of an insulating metal oxide, and a capacitor upper electrode which are formed in upwardly stacked relationship on the protective insulating film, a first contact plug formed in the protective insulating film to provide a direct connection between an impurity diffusion layer serving as a source or drain region of the first field-effect transistor and the capacitor lower electrode; a second contact plug formed in the protective insulating film to provide a connection between a first impurity diffusion layer serving as a source or drain region of the second field-effect transistor and the capacitor upper electrode; a hydrogen barrier film entirely covering a plurality of the capacitor upper electrodes, and the hydrogen barrier film also continuously covering the capacitor upper electrode and an upper portion of the second contact plug; and an interconnection formed over the protective insulation film and electrically connected to a second impurity diffusion layer serving as another source or drain region of the second field-effect transistor, wherein the capacitor lower electrode includes a plurality of capacitor lower electrodes formed on the protective insulating film, the capacitor insulating film is formed over the plurality of capacitor lower electrodes and the protective insulating film, and the capacitor upper electrode is electrically connected to the interconnection through the first and second impurity diffusion layers of the second field-effect transistors so as not to break the hydrogen barrier layer.