Patent ID: 7151016

Claim:
A method for manufacturing a semiconductor device, said method comprising: forming a first insulating film over a substrate; forming a semiconductor film over the first insulating film; forming a second insulating film over the semiconductor film; forming a first conductive film over the second insulating film; forming a second conductive film over the first conductive film; first etching the first conductive film, the second conductive film, and a portion of the second insulating film to form a thin portion and a thick portion of the second insulating film; second etching the first conductive film and the second conductive film etched in the first etching step to form a gate electrode having the first conductive film and the second conductive film; first introducing a hydride having an n-type impurity element or a hydride having a p-type impurity element into the semiconductor film through the thin portion of the second insulating film using the first conductive film as a mask at a first acceleration voltage by a plasma doping technique or an ion doping technique after the second etching step; second introducing the hydride having an n-type impurity element or the hydride having a p-type impurity element into the semiconductor film through the first conductive film and the second insulating film using the second conductive film as a mask at a second acceleration voltage so that an H concentration depth profile peak due to H 3 produced by ionization of the hydride having an n-type impurity element or the hydride having a p-type impurity element is located in at least one selected from the group consisting of the thick portion of the second insulating film and the gate electrode after the first introducing step; and performing a thermal treatment by a laser annealing technique or a RTA technique, or a hydrogenating treatment, wherein the H concentration depth profile peak is not located in the semiconductor film below the gate electrode.