SEMICONDUCTOR DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a transistor having stable electrical characteristics; or provide a transistor having less current in a non-conductive state; or provide a transistor having a large current in a conductive state; or provide a semiconductor device having the above-described transistor; or provide a tough semiconductor device.SOLUTION: A semiconductor device comprises: a first transistor using silicon; an aluminum oxide film on the first transistor; and a second transistor which is on the aluminum oxide and uses an oxide semiconductor, in which the oxide semiconductor has a hydrogen concentration lower than that of silicon.