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Method of manufacturing semiconductor integrated circuit device comprising a memory cell and a capacitor

Image Number 2 for United States Patent #6746913.

A silicon oxide film on which a capacitor of a semiconductor integrated circuit device is formed is formed by the plasma CVD method at a temperature of C. to C. In this semiconductor integrated circuit device, a memory cell formed of a MISFET for data transfer and a capacitor is formed in a memory cell forming area, and an n channel MISFET and a p channel MISFET constituting a logic circuit is formed in a logic circuit forming area. As a result, the amount of degassing from the silicon oxide film can be reduced. Therefore, the growth of silicon grains on a surface of the silicon film constituting a lower electrode of the capacitor is not hindered by the degassing, and it becomes possible to increase the capacitance. Also, the step of a heat treatment for removing the moisture and the like after forming the silicon oxide film can be omitted, and it becomes possible to prevent the deterioration of the property of the MISFET.

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