Patent ID: 7064346

Claim:
A transistor, comprising: an emitter, a collector and a base selected from the group consisting of: (a) an emitter and a collector made of a transparent n-type semiconductor, and a base made of a transparent p-type semi conductor, and (b) a base made of a transparent n-type semiconductor, and an emitter and a collector made of a transparent p-type semiconductor, said n-type semiconductor comprising any one of zinc oxide ZnO, zinc magnesium oxide Mg x Zn 1-x O, zinc cadmium oxide Cd x Zn 1-x O and cadmium oxide CdO, doped with group III elements or group VII elements, and said transparent p-type semiconductor comprising any one of zinc oxide ZnO, zinc magnesium oxide Mg x Zn 1-x O, zinc cadmium oxide Cd x Zn 1-x O and cadmium oxide CdO, doped with group I elements or group V elements; and a base electrode, an emitter electrode and a collector electrode, in which (1) a transparent conductive material doped or undoped with any one of group III elements, group VII elements and group I elements, (2) a transparent conductor, or (3) an untransparent electrode material are used partially or entirely, the base electrode, the emitter electrode and the collector electrode being respectively formed on said base, said emitter and said collector.