Patent ID: 6787883
Filing Date: 2004-09-07
Classification: H01L

Abstract:
A p-channel metal-oxide-semiconductor transistor, comprising:a silicon substrate; a silicon dioxide (SiO2) gate oxide, coupled to the substrate; a gate, coupled to the SiO2 gate oxide; source/drain regions formed in the substrate on opposite sides of the gate; a Si1âˆ’xGex channel region, having a germanium molar fraction x, located underneath the SiO2 gate oxide and between the source/drain regions, wherein x is less than or equal to 0.6, and wherein the Si1âˆ’xGex channel region forms a continuous Si1âˆ’xGex/SiO2 gate oxide interface wherein no germanium oxide is present at the Si1âˆ’xGex/SiO2 gate oxide interface; and wherein the Si1âˆ’xGex channel region is formed from ion implanting Germanium (Ge) into the substrate at a dose of approximately 2Ã—1016 atoms/cm2, and wherein the Ge is implanted at an energy of approximately 20 to 100 keV.