Patent ID: 8361874

Claim:
A method of manufacturing a semiconductor device, comprising: forming a first insulating film in a resistor element formation region of a semiconductor substrate; forming a gate insulating film in a transistor formation region of the semiconductor substrate; forming a semiconductor film above the first insulating film while forming a gate made of semiconductor above the gate insulating film; forming impurity regions by ion-implanting a conductive impurity into the transistor formation region of the semiconductor substrate with the gate used as a mask, the impurity regions formed to be a source and a drain; forming a second insulating film covering the semiconductor film, the impurity regions and the gate; forming a resist film above the second insulating film in the transistor formation region; ion-implanting a conductive impurity into the semiconductor film with the resist film used as a mask under a condition that the conductive impurity penetrates through the second insulating film in the resistor element formation region; removing the resist film by ashing; and removing the second insulating film in the transistor formation region while leaving the second insulating film in the resistor element formation region.