Patent ID: 8778745

Claim:
A method for manufacturing a semiconductor device, comprising the steps of: forming an insulating film over a substrate; forming a seed over the insulating film by introducing hydrogen and a deposition gas into a first treatment chamber under a first condition: a first flow rate of hydrogen is greater than or equal to 5.0×10 1 times and less than or equal to 1.0×10 3 times a first flow rate of the deposition gas; and a first pressure in the first treatment chamber is higher than or equal to 0.5 Torr and lower than or equal to 10 Torr; and forming a microcrystalline semiconductor film over the seed by introducing hydrogen and the deposition gas into a second treatment chamber under a second condition: a second flow rate of the deposition gas is periodically changed between a first value and a second value; and a second pressure in the second treatment chamber is higher than or equal to 10 Torr and lower than or equal to 100 Torr, wherein the second value is lower than the first value, and wherein a flow rate ratio of the deposition gas with respect to hydrogen in the second treatment chamber is periodically changed during forming the microcrystalline semiconductor film.