Patent ID: 8647933

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: introducing a non-source gas into a microwave plasma CVD apparatus; generating a plasma with the non-source gas by the microwave plasma CVD apparatus; introducing a source gas after generating the plasma; and forming a microcrystalline semiconductor film of a thin film transistor with the source gas by the microwave plasma CVD apparatus with a frequency of greater than or equal to 1 GHz, wherein the microwave plasma CVD apparatus is provided with a plurality of waveguides which is over a plurality of dielectric plates, wherein a first gas pipe and a second gas pipe are provided to intersect with each other between a substrate and the plurality of dielectric plates, wherein the non-source gas is released from an outlet of the first gas pipe provided on the plurality of dielectric plates side, and wherein the source gas is released from an outlet of the second gas pipe provided on the substrate side.