Patent ID: 9443984
Filing Date: 2016-09-13
CPC Classification: H01L

Claim Text:
1. A semiconductor device comprising: a first insulating film comprising oxygen; an oxide semiconductor layer formed on the first insulating film, the oxide semiconductor layer comprising indium, zinc and gallium, wherein the oxide semiconductor layer includes a channel formation region and a source region and a drain region with the channel formation region therebetween; a gate insulating layer over the oxide semiconductor layer; a gate electrode over the channel formation region with the gate insulating layer therebetween; a second insulating film comprising silicon oxide over the gate electrode; and a third insulating film comprising aluminum oxide over the second insulating film, wherein the source region and the drain region are selectively doped with at least one element selected from rare gases and hydrogen, wherein at least a portion of the oxide semiconductor layer comprises a crystalline region where a c-axis is aligned approximately in parallel with a normal vector of a surface of the portion of the oxide semiconductor layer, and wherein the amount of oxygen released from the first insulating film is greater than or equal to 3.0×10