Mechanism Of The Influence Of Nb₂O₅ On The Luminescent Properties Of Semiconductor Materials The Study

The surface enhancement effect of the base material and the coated nanomaterials can increase the luminescence spectrum intensity of the detected substance or molecule by several orders of magnitude,This feature has been widely concerned by researchers at home and abroad in the field of Raman enhanced spectroscopy and has been widely used.In recent years,the research and application of surface-enhanced spectroscopy technology for semiconductor materials has gradually attracted the attention of researchers at home and abroad.The study found that by using various special semiconductor materials to coat or modify the tested materials,Can greatly increase the fluorescence and infrared spectrum intensity of some detected objects,This technology has important research value and application prospects for material analysis and trace detection.At present,there are few reports and studies on the fluorescence enhancement effect on the semiconductor surface,the theoretical mechanism of the fluorescence enhancement effect and the depth of experimental research need to be improved.In this paper,by using n-type Nb₂O₅ as the substrate and cladding material,Using radio frequency magnetron technology to coat and modify Nb₂O₅ film on ZnO nanowire,TiO₂ nanostructure,SnO film and Ga₂O₃ film,Experimentally and theoretically studied before and after coating and modifying Nb₂O₅ film,Variation characteristics of different materials' morphology and microstructure photoluminescence intensity,The physical mechanism of the surface-enhanced fluorescence enhancement of the nanostructure surface was analyzed.The main research work of the thesis is as follows:?1?Adopting hydrothermal synthesis method,Under different conditions,oriented ZnO and TiO₂ nanowire arrays were prepared.The effects of ammonia concentration and reaction time in hydrothermal synthesis on the structure and morphology parameters of the growing oriented ZnO and TiO₂ nanowire arrays were studied,The goal of adjusting the growth orientation ZnO and TiO₂ nanowire array morphology and photoluminescence characteristics by changing the preparation parameters was achieved.?2?Using magnetron sputtering technology,Using Nb₂O₅ as the target,by adjusting the sputtering time and sputtering power,On the samples of different ZnO and TiO₂ nanowire arrays prepared earlier,a layer of Nb₂O₅ thin films with different thicknesses was sputter coated.The microstructure of the samples before and after sputter-coated Nb₂O₅ thin film was tested by XRD test technique.The test compared the photoluminescence characteristics of thesamples before and after being coated with Nb₂O₅ film.The study found that by controlling the sputtering time,The thickness of the coated Nb₂O₅ film can be controlled,The ZnO and TiO₂ nanowire array samples are different,the thickness of the coated Nb₂O₅ film is different,and the photoluminescence characteristics are also different.Coated Nb₂O₅ film can effectively enhance the luminous intensity of ZnO and TiO₂ nanowire array samples.?3?Using magnetron sputtering technology,First,SnO and Ga₂O₃ films with different thicknesses were deposited on Si substrates.The morphology and luminescence characteristics of SnO and Ga₂O₃ films were analyzed.The study found that the morphology,thickness and luminescence characteristics of SnO and Ga₂O₃ films can be adjusted by adjusting the sputtering deposition time.Subsequently,a layer of nanoscale Nb₂O₅ film was sputter-deposited on the prepared SnO and Ga₂O₃ thin film samples to form a composite structure.The crystal structure of the composite structure prepared under different conditions was compared and analyzed with XRD analyzer.The luminescence characteristics of samples with different composite structures were studied.The study found that after depositing Nb₂O₅nano-films on SnO and Ga₂O₃ films,the ultraviolet luminescence peak intensity of the composite structure samples weakened and the defect luminescence peak intensity increased.?4?According to the PL curve compared by the test,the influence of preparation conditions such as sputtering deposition time and sputtering power on the fluorescence spectrum of the nanostructure coated with Nb₂O₅ film is given.The physical mechanism of the surface enhanced spectral characteristics of the nanoarray and the film before and after coating the Nb₂O₅ film was theoretically analyzed.The research results have important application value for the development of the fluorescent optical properties of Nb₂O₅ thin film materials,the enhancement of their luminous intensity,and the development of new Nb₂O₅ thin film optical applications.