An all-transparent photodetector was fabricated by structuring Cu₂O/ZnO/AZO/ITO on a glass substrate. The visible-range transmittance was as high as 80%, which ensures clear vision forhuman eyes. High-transparency metal conductive oxides (p-type Cu₂O and n-type ZnO) were appliedto form the transparent p/n junction. The functional AZO layer was adopted to improve the transparent photodetector performance between the ZnO and ITO, improving the photoresponses because of its electrical conductivity. To clarify the AZO functionality, a comparator device was prepared without the AZO layer in the formation of Cu₂O/ZnO/ITO/Glass. The Cu₂O/ZnO/AZO/ITO device provided a rectifying ratio of 113.46, significantly better than the 9.44 of the Cu₂O/ZnO/ITO device. In addition, the Cu₂O/ZnO/AZO/ITO device`s photoresponses at short wavelengths were better than those of the comparator. The functioning AZO layer provides ahigh-performing transparent Cu oxide photodetector and may suggest a route for the design of efficient photoelectric devices.

In this study, Ni0.79(Mn2.21-χCuχ)O4 (x=0~0.25) specimens were prepared by using a conventional mixed oxide method. All specimens were sintered in air at 1,℃ for 12 h and cooled at a rate of 2℃/min to 800℃, subsequently quenching to room temperature. We investigated the structural and electrical properties of Ni 0.79(Mn2,21-χCuχ)O4 specimens with variation of CuO amount for the application of NTC thermistors. As results of X-ray diffraction patterns, all specimens showed the formation of a complete solid solution with cubic spinel phase. The relationship between ln ρ and the reciprocal of absolute temperature(1/T) for the NTC thermistors was shown linearity, which exhibited the typical NTC thermistor properties. With increasing the amount of CuO, resistivity at room temperature, B-value, and temperature coefficient resistance decreased.