Patent ID: 9559174
Date: 2017-01-31
CPC Classifications: C01G,C01P,H01L

Claim:
1. A semiconductor device comprising: an oxide semiconductor layer comprising In, Ga, and Zn; and an insulating layer that contains oxygen in excess of the stoichiometric composition, wherein the insulating layer and the oxide semiconductor layer overlap each other, wherein an atomic ratio of In to Ga and Zn in the oxide semiconductor layer satisfies In:Ga:Zn=x:y:z, wherein, in an equilibrium diagram with vertices of the three elements of In, Ga, and Zn, the atomic ratio is within a range of an area surrounded by line segments that connect first coordinates (x:y:z=35:20:22), second coordinates (x:y:z=7:4:11), third coordinates (x:y:z=5:1:6), fourth coordinates (x:y:z=25:10:14), and the first coordinates, in this order, and wherein the oxide semiconductor layer includes a plurality of crystals.