Patent ID: 9218966
Filing Date: 2015-12-22
Classification: H01L

Abstract:
1. A semiconductor device comprising: a layer over a substrate, the layer comprising an insulating film, a first conductive film and a second conductive film; an In—Zn—Ga-based oxide semiconductor film over each of the insulating film, the first conductive film and the second conductive film, the In—Zn—Ga-based oxide semiconductor film comprising a first portion which has crystallinity; a source electrode and a drain electrode over the In—Zn—Ga-based oxide semiconductor film; a gate insulating film over the In—Zn—Ga-based oxide semiconductor film, the gate insulating film comprising an oxide comprising silicon; and a gate electrode over the gate insulating film, the gate electrode overlapping the In—Zn—Ga-based oxide semiconductor film, wherein the source electrode and the first conductive film overlap each other, wherein the drain electrode and the second conductive film overlap each other, wherein each of the source electrode, the drain electrode, the first conductive film and the second conductive film is electrically connected to the In—Zn—Ga-based oxide semiconductor film, wherein the In—Zn—Ga-based oxide semiconductor film comprises a first region in which a concentration of silicon distributed from an interface with the gate insulating film toward an inside of the In—Zn—Ga-based oxide semiconductor film is lower than or equal to 1.1 at. %, wherein the In—Zn—Ga-based oxide semiconductor film further comprises a second region under the first region, and wherein a concentration of silicon contained in the second region is lower than the concentration of silicon contained in the first region.