Patent ID: 9029852
Filing Date: 2015-05-12
Classification: G02F,H01L

Abstract:
1. A semiconductor device comprising: a gate electrode; a gate insulating film covering the gate electrode; an oxide semiconductor film provided to be in contact with the gate insulating film and overlap with at least the gate electrode; a channel protective film provided to be in contact with the oxide semiconductor film; and a source electrode and a drain electrode which are provided over the channel protective film and electrically connected to the oxide semiconductor film, wherein the gate insulating film includes silicon and oxygen, wherein the oxide semiconductor film includes a first region in contact with the gate insulating film, wherein a concentration of silicon in the first region is lower than or equal to 1.0 at. %, wherein at least the first region includes a crystal portion, and wherein a concentration of silicon included in a region of the oxide semiconductor film other than the first region is lower than the concentration of silicon included in the first region.