Patent ID: 9450104
Filing Date: 2016-09-20
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: an oxide semiconductor film on an insulating surface, the oxide semiconductor film including a first region, a second region, and a third region; a gate insulating film over the oxide semiconductor film; a gate electrode over the gate insulating film, the gate electrode overlapping with the first region; a first electrode electrically connected to the second region; and a second electrode electrically connected to the third region, wherein the first region is interposed between the second region and the third region, wherein, in the first region, c-axes of crystals are aligned substantially perpendicularly to the insulating surface throughout a thickness of the oxide semiconductor film; wherein each of the second region and the third region is added with an impurity element and comprises a first portion in contact with the insulating surface and a second portion over the first portion, wherein the second portion has a polycrystalline oxide semiconductor, and wherein, in the second portion, c-axes of crystals are aligned substantially perpendicularly to the insulating surface.