Patent ID: 9722056
Date: 2017-08-01
CPC Classifications: H01L

Claim:
1. A method for manufacturing a semiconductor device comprising the steps of: introducing oxygen into a surface of an insulating film; forming an oxide semiconductor film over the insulating film; forming a layer over the oxide semiconductor film and the insulating film; forming a conductive layer over the layer; processing the layer and the conductive layer into an island-shaped film and an island-shaped conductive film, respectively; processing the island-shaped film and the island-shaped conductive film into a film and a pair of electrodes, respectively; forming a first gate insulating film over the film and the pair of electrodes; and forming a first gate electrode over the first gate insulating film, the first gate electrode overlapping with the oxide semiconductor film, wherein the film is capable of blocking oxygen, wherein the film includes a pair of first regions and a second region, wherein the pair of first regions overlaps with the pair of electrodes, wherein the second region does not overlap with the pair of electrodes, wherein the second region overlaps with the first gate electrode, and wherein a width of each of the pair of first regions is longer than a width of the second region in a channel width direction, wherein at least one of the first gate insulating film and the insulating film has a first signal, a second signal, and a third signal, wherein the first signal appears at a g-factor of greater than or equal to 2.037 and less than or equal to 2.039, wherein the second signal appears at a g-factor of greater than or equal to 2.001 and less than or equal to 2.003, wherein the third signal appears at a g-factor of greater than or equal to 1.964 and less than or equal to 1.966, and wherein a sum of spin densities of the first signal, the second signal, and the third signal is lower than 4×10