Semiconductor integrated circuit device with MOS transistor and MOS capacitor and method for manufacturing the same
First Claim
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1. A semiconductor integrated circuit device, comprising:
- a semiconductor substrate;
a MOS type field effect transistor having a first silicon oxide film formed on said semiconductor substrate as a gate insulating film; and
a capacitor having a second silicon oxide film on said semiconductor substrate as a dielectric film, a first electrode comprising a portion of said semiconductor substrate and a second electrode on said second silicon oxide film;
wherein said second silicon oxide film is thicker than said first silicon oxide film.
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Abstract
A method for fabricating a semiconductor device using an etching stopper film without increasing a number of steps of photoetching and without degrading the device characteristics. A MOS capacitor having a small coefficient of voltage is formed by forming a thick oxide film which is different from a gate oxide film of a MOS transistor to be formed on the same substrate and by implanting impurity of an amount which will not destroy insulation right under the oxide film. At this time, the electrode of the MOS capacitor is formed by the same layer with that of the gate electrode of the MOS transistor to equalize the height of both the electrodes.
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Citations
16 Claims
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1. A semiconductor integrated circuit device, comprising:
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a semiconductor substrate; a MOS type field effect transistor having a first silicon oxide film formed on said semiconductor substrate as a gate insulating film; and a capacitor having a second silicon oxide film on said semiconductor substrate as a dielectric film, a first electrode comprising a portion of said semiconductor substrate and a second electrode on said second silicon oxide film; wherein said second silicon oxide film is thicker than said first silicon oxide film. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A semiconductor integrated circuit device, comprising:
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a semiconductor substrate including a well region of one type of conductivity; a MOS type field effect transistor having a first silicon oxide film formed on said well region as a gate insulating film; a capacitor having a second silicon oxide film formed on said semiconductor substrate as a dielectric film, a first electrode comprising a potion of said well region and a second electrode formed on said second silicon oxide film, said second silicon oxide film having a thickness which reduces a voltage dependency of said capacitor and which is thicker than the thickness of said first silicon oxide film; and a high concentrate impurity diffusing region provided below said second silicon oxide film and having a conductivity type opposite to the one type of conductivity of said well region. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification