Patent ID: 8426295

Claim:
A manufacturing method of a microcrystalline silicon film comprising the steps of: forming a first microcrystalline silicon film over an insulating film by a first plasma CVD method, under a first condition by alternately supplying a first supply gas including a first deposition gas and first hydrogen, and a second supply gas including a second deposition gas and second hydrogen; and forming a second microcrystalline silicon film over the first microcrystalline silicon film by a second plasma CVD method, under a second condition by supplying a third supply gas including a third deposition gas and third hydrogen, wherein the first microcrystalline silicon film comprises mixed phase grains comprising a silicon crystallite and amorphous silicon, wherein the first condition is a condition that a first treatment chamber is set to be higher than or equal to 67 Pa and lower than or equal to 1333 Pa, and the second condition is a condition that a second treatment chamber is set to be higher than or equal to 1333 Pa and lower than or equal to 13332 Pa, wherein a flow rate of the first hydrogen is greater than or equal to 50 times and less than or equal to 1000 times a flow rate of the first deposition gas, wherein a flow rate of the second deposition gas is less than the flow rate of the first deposition gas so as to primarily cause etching of silicon deposited over the insulating film rather than deposition of silicon over the insulating film, and wherein a flow rate of the third hydrogen is greater than or equal to 100 times and less than or equal to 2000 times a flow rate of the third deposition gas.