Patent ID: 6699776
Filing Date: 2004-03-02
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device where a first circuit operating on a first voltage and a second circuit operating on a second voltage lower than said first voltage are formed in a single chip and a p-type conductivity material is used for a gate electrode of a p-channel transistor constituting said second circuit, comprising:forming an oxynitride film of nitrogen-added SiO2 as a gate insulating film of the p-channel transistor constituting said second circuit; forming a gate electrode material layer of the p-channel transistor constituting said second circuit on said oxynitride film; forming an SiO2 film as a gate insulating film of a transistor constituting said first circuit; and forming a gate electrode material layer for the transistor constituting said first circuit on said gate insulating film, wherein the gate insulating film and the gate electrode material layer of the transistor constituting said first circuit are formed in processes different from processes in which the gate insulating film and the gate electrode material layer of the p-channel transistor constituting said second circuit are formed.