Patent ID: 6593229
Filing Date: 2003-07-15
Classification: H01L

Abstract:
A process for manufacturing a semiconductor integrated circuit device, which comprises steps of:(a) forming, over the silicon surface on the first main surface of a wafer, a first film containing, as a principal component, a first refractory metal which has a redox equilibrium curve in a water vapor and hydrogen containing gas atmosphere on the lower water vapor side than that of silicon; (b) heat treating the first main surface, which has the first film formed thereover, in a water vapor and hydrogen containing gas atmosphere having a water vapor hydrogen partial pressure ratio set at a ratio permitting oxidation of the first refractory metal without substantial oxidation of the silicon surface, thereby converting the first refractory metal without substantial oxidation of the silicon surface, thereby converting the first refractory metal to the oxide thereof to form a gate insulating film on the first main surface; and (c) prior to or after step (b), forming a gate electrode by patterning a second refractory metal which has a redox equilibrium curve in a water vapor and hydrogen containing gas atmosphere on the higher water vapor side than that of silicon.