ULTRAVIOLET RAY SENSOR, AND PROCESS FOR PRODUCTION OF ULTRAVIOLET RAY SENSOR

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Disclosed is an ultraviolet ray sensor comprising : a p-type semiconductor layer (1) which is mainly composed of a solid solution of NiO and ZnO; and a n-type semiconductor layer (2) which is mainly composed of ZnO and is bound to the p-type semiconductor layer (1) in such a state where a part of the surface of the p-type semiconductor layer (1) is exposed. A first terminal electrode (3a) that is connected to an internal electrode (4) and a second terminal electrode (3b) that is connected to the n-type semiconductor layer (2) are formed at both ends of the p-type semiconductor layer (1), respectively. The internal electrode (4) is composed of a composite oxide represented by general formula : RNiO3 or the like, containing a rare earth element (R) and Ni as the main components, and having low resistivity. The ultraviolet ray sensor can detect ultraviolet ray readily as a photovoltaic power without the need of using any peripheral circuit and without causing delamination or the like, is inexpensive, and can have a reduced size.