Patent ID: 9698277
Date: 2017-07-04
CPC Classifications: C23C,H01L

Claim:
1. A semiconductor device comprising: a first insulator over a substrate; a first oxide insulator over the first insulator; an oxide semiconductor in contact with the first oxide insulator; a second oxide insulator in contact with the oxide semiconductor; a third oxide insulator in contact with the second oxide insulator; a second insulator over the third oxide insulator; a first conductor over the second insulator; and a third insulator over the first conductor, wherein an energy level of a conduction band minimum of each of the first oxide insulator and the second oxide insulator is closer to a vacuum level than an energy level of a conduction band minimum of the oxide semiconductor is, wherein an energy level of a conduction band minimum of the third oxide insulator is closer to the vacuum level than the energy level of the conduction band minimum of the second oxide insulator is, and wherein number of oxygen molecules released from the first insulator measured by thermal desorption spectroscopy is greater than or equal to 1.0×10