Study On Photoelectric Properties Of WO₃-based Ternary Metal Tungstate Composite Film

The rapid development of social industry has brought many problems to the living environment of human beings,among which the problem of water pollution is particularly prominent.In this context,new materials and new energy sources have become the current research hotspots.Semiconductor materials with good photoelectric properties have been rapidly developed and applied in the fields of solar cells and sewage treatment.How to prepare semiconductor thin film materials with better photoelectric properties has become an important research direction in recent years.This thesis takes WO₃/NiWO₄ nano-film,WO₃/CuWO₄ nano-film and WO₃/ZnWO₄ nano-film as the core research objects.The specific research contents are as follows:(1)Using conductive glass as the substrate,WO₃ nano-film is prepared by hydrothermal method.Then WO₃/NiWO₄ composite films with different hydrothermal reaction time(1h,3h,5h)were prepared on WO₃ nano-film.The synthesis and characterization of the WO₃/NiWO₄ composite films were performed by X-ray diffraction test and scanning electron microscope test.The photoelectric performance parameters of WO₃/NiWO₄ composite film samples were obtained by absorption spectrum test,photocurrent test,photoelectric catalytic test and AC impedance test.The analysis results show that the WO₃/NiWO₄ composite film sample has a wider spectral response range,higher photocurrent density and significantly improved photoelectric catalytic efficiency than WO₃ nano-film.The WO₃/NiWO₄ composite film samples with hydrothermal reaction for 3h have the highest photocurrent density and the best photoelectric catalytic efficiency than the samples which hydrothermal reaction time is 1h and 5h.(2)Using conductive glass as the substrate,WO₃ nano-film is prepared by hydrothermal method.Then WO₃/CuWO₄ composite films with different hydrothermal reaction time(3h,5h,7h)were prepared on WO₃ nano-film.The synthesis and characterization of the WO₃/CuWO₄ composite films were performed by X-ray diffraction test and scanning electron microscope test.The photoelectric performance parameters of WO₃/CuWO₄ composite film samples were obtained by absorption spectrum test,photocurrent test,photoelectric catalytic test and AC impedance test.The analysis results show that the WO₃/CuWO₄ composite film sample has a wider spectral response range,higher photocurrent density and significantly improved photoelectric catalytic efficiency than WO₃ nano-film.The WO₃/CuWO₄ composite film samples with hydrothermal reaction for 5h have the highest photocurrent density and the best photoelectric catalytic efficiency than the samples which hydrothermal reaction time is 3h and 7h.(3)Using conductive glass as the substrate,WO₃ nano-film is prepared by hydrothermal method.Then WO₃/ZnWO₄ composite films with different hydrothermal reaction time(1h,3h,5h)were prepared on WO₃ nano-film.The synthesis and characterization of the WO₃/ZnWO₄ composite films were performed by X-ray diffraction test and scanning electron microscope test.The photoelectric performance parameters of WO₃/ZnWO₄ composite film samples were obtained by absorption spectrum test,photocurrent test,photoelectric catalytic test and AC impedance test.The analysis results show that the WO₃/ZnWO₄ composite film sample has a wider spectral response range,higher photocurrent density and significantly improved photoelectric catalytic efficiency than WO₃ nano-film.The WO₃/ZnWO₄ composite film samples with hydrothermal reaction for 3h have the highest photocurrent density and the best photoelectric catalytic efficiency than the samples which hydrothermal reaction time is 1h and 5h.