Patent ID: 8093589

Claim:
A semiconductor device comprising: an active layer, to which nitrogen and hydrogen are added, and which is made of a semiconductor containing (i) polycrystalline ZnO or polycrystalline Mg x Zn 1-x O, (ii) amorphous ZnO or amorphous Mg x Zn 1-x O, or (iii) either (a) mixture of polycrystalline ZnO and amorphous ZnO or (b) mixture of polycrystalline Mg x Zn 1-x O and amorphous Mg x Zn 1-x O; and a blocking member for blocking the active layer from an atmosphere such that the atmosphere substantially does not influence a region, in which a movable charge moves, of the active layer, wherein said active layer includes intentionally added dopants essentially consisting of said nitrogen and said hydrogen having concentrations so that a threshold voltage of a gate voltage of the semiconductor device, when a voltage between a drain and a source region is fixed at 10V, is controlled to be substantially is in a range between 0V and 3V.