Semiconductor device and process for fabricating the same

摘要

A semiconductor device comprising a MIS structure comprising a first electrically conductive film formed on an oxide film, a second electrically conductive film formed on at least a part of said first electrically conductive film, an insulator film formed on said second electrically conductive film, and a third electrically conductive film formed on said insulator film; and at least one electrode contact portion formed on said first electrically conductive film. A semiconductor device comprising a MIS capacitor having a diffusion layer inside the semiconductor substrate as a lower electrode with a first electrically conductive type being isolated using another diffusion layer having the opposite conductive type, and said another diffusion layer having the opposite conductive type being further isolated using a diffusion layer for isolation having the first conductive type and which is earthed. A BiCMOS semiconductor device comprising a resistor and an impurity source for the emitter and the emitter electrode for the bipolar transistor made of a same conductor layer, and further, a same conductor layer is provided as the contact electrode for the resistor and the gate for the MOS transistor. Also claimed are processes for fabricating the aforementioned semiconductor devices.