Patent ID: 8603899

Claim:
A method of manufacturing a semiconductor device, comprising: cleaning inside of a film forming chamber with a cleaning gas containing fluorine; forming a first insulating film comprising silicon and nitrogen over a substrate in the film forming chamber; forming a semiconductor film over the first insulating film in the film forming chamber by using a film formation gas comprising a silane gas; patterning the semiconductor film to form a semiconductor layer; forming a second insulating film over the semiconductor layer; forming a gate electrode over the semiconductor layer with the second insulating film therebetween; forming an interlayer insulating film over the gate electrode; forming a pixel electrode over the interlayer insulating film, the pixel electrode being electrically connected to the semiconductor layer; and forming a light emitting layer over the pixel electrode, wherein forming the first insulating film and forming the semiconductor film are sequentially performed without exposing an atmosphere, and wherein fluorine is contained in the semiconductor layer in a concentration of 1×10 18 atoms/cm 3 or less.