Patent ID: 8859404

Claim:
A manufacturing method of a microcrystalline semiconductor film, comprising: forming a seed crystal that includes mixed phase grains with a space provided between the mixed phase grains over an insulating film; forming a first microcrystalline semiconductor film over the seed crystal, so that the mixed phase grains grow to fill the space provided between the mixed phase grains by a plasma CVD method under a first condition in which a deposition gas comprising silicon is diluted by setting a flow rate of hydrogen to more than or equal to 100 times and less than or equal to 2000 times that of the deposition gas and the pressure in the process chamber is higher than or equal to 1333 Pa and lower than or equal to 13332 Pa; and forming a second microcrystalline semiconductor film over the first microcrystalline semiconductor film so as not to increase the space provided between the mixed phase grains included in the first microcrystalline semiconductor film by a plasma CVD method under a second condition in which hydrogen and a deposition gas comprising silicon are supplied to the process chamber in a state of alternately increasing and decreasing a flow rate ratio of the deposition gas to hydrogen and the pressure in the process chamber is higher than or equal to 1333 Pa and lower than or equal to 13332 Pa.