Patent ID: 7056775

Claim:
A method of manufacturing a semiconductor device comprising the steps of: forming a non-single crystalline semiconductor film over an insulating surface of a substrate; providing a material for promoting crystallization to a portion of the non-single crystalline semiconductor film; crystallizing the non-single crystalline semiconductor film by heating after providing the material; forming a gate insulating film over the semiconductor film; forming first and second gate electrodes over the gate insulating film; adding a first impurity element to the semiconductor film by using the first gate electrode to form a pair of first impurity regions; adding a second impurity element to the semiconductor film by using the second gate electrode to form a pair of second impurity regions; and forming a common wiring connected to one of the pair of first impurity regions and one of the pair of second impurity regions wherein said one of the pair of first impurity regions is continuous with said one of the pair of second impurity regions, wherein said portion of the semiconductor film is included in said one of the pair of first impurity regions and said one of the pair of second impurity regions.