Patent ID: 6991997

Claim:
A method of manufacturing a semiconductor device comprising: forming a first semiconductor film over an insulating surface; forming a barrier film on the first semiconductor film; forming a second semiconductor film on the barrier film by sputtering, the second semiconductor film comprising an inert gas element at a concentration of 1×10 19 cm 3 to 1×10 22 /cm 3 ; performing gettering of an impurity into the second semiconductor film to remove or reduce the impurity in the first semiconductor film; and removing the second semiconductor film, wherein a compression stress in the second semiconductor film has a range from −10.0×10 10 dynes/cm 2 to −5.0×10 9 dynes/cm 2 , and wherein an RF electric power density in the step of forming the second semiconductor film is 0.137 to 6.847 W/cm 2 .