Patent ID: 6956235

Claim:
A semiconductor device comprising: a crystalline semiconductor film; a channel formation region provided in the crystalline semiconductor film, the crystalline semiconductor film comprising silicon and germanium at least in the channel formation region; a source region and a drain region sandwiching the channel formation region therebetween; and a gate electrode provided adjacent to the channel formation region with a gate insulating film therebetween, wherein 20% or more of the channel formation region is the {101} lattice plane that forms an angle of equal to or less than 10 degrees with respect to the surface of the crystalline semiconductor film, the plane being detected by an electron backscatter diffraction pattern method; 3% or less of the channel formation region is the {001} lattice plane that forms an angle of equal to or less than 10 degrees with respect to the surface of the crystalline semiconductor film; 5% or less of the channel formation region is the {111} lattice plane that forms an angle of equal to or less than 10 degrees with respect to the surface of the crystalline semiconductor film; secondary ion mass spectroscopy is conducted on the channel formation region to reveal that the region contains less than 5×10 18 nitrogen atoms per cm 3 , less than 5×10 18 carbon atoms per cm 3 , and less than 1×10 19 oxygen atoms per cm 3 , and said semiconductor device is provided in a NAND circuit.