Preparation And Photodetection Performance Of ZnO-based Hybrid Nanoarrays

In recent years,one-dimensional organic/inorganic semiconductor core-shell structure nanocomposites based on ZnO have become one of the key materials in the semiconductor field(including photovoltaic cells,photodetectors,photocatalysis,gas sensors,etc.).Compared with traditional planar devices,highly ordered one-dimensional ZnO nanomaterials have a larger specific surface area,which is conducive to the absorption of light energy and can effectively enhance the photoelectric conversion efficiency of the device.However,due to the difficulty in achieving p-type transformation of ZnO,it hinders the formation of its own p-n junction,and the shortcomings of single component ZnO such as narrow spectral absorption range,low carrier mobility and easy recombination,which to some extent limit its application in the field of high-performance semiconductors.At present,many experts and scholars are committed to developing optoelectronic nanomaterials with new structures and high performance.Multiphase or multi-component heterostructures have become an important platform for building optoelectronic materials with stable structure and excellent performance by virtue of the adjustability of their energy band structure and the efficiency of the electron hole separation process.Therefore,selecting appropriate building blocks,designing specific heterostructures,and utilizing the synergistic effects generated by multi-component materials to construct ZnO based low dimensional hybrid nanomaterials with excellent spectral selectivity and photoelectric response properties is currently one of the research hotspots in the field of nanotechnology.This project selects ZnO,ZnS,and Cd S as n-type semiconductor components,and PPV(poly para styrene)as p-type semiconductor components.On the one hand,the built-in electric field of the p-n junction is used to promote the separation of photo generated electron hole pairs,and on the other hand,the good energy level matching effect between different components is utilized to effectively suppress the recombination of photo generated electrons and holes,thereby improving its photoelectric response performance,In order to prepare a series of high-performance large-area hybrid nanoarrays with dual UV visible response.Firstly,hydrothermal method and electrochemical deposition method were used to compare the effects of experimental parameters(reaction temperature,growth time,deposition voltage,reactant concentration,etc.)on the morphology of ZnO nanorod arrays,achieving controlled preparation of ZnO nanorod arrays.ZnO nanorod arrays with good crystal growth and uniform diameter distribution were obtained;On this basis,the SILAR(successive ionic layer adsorption and reaction)method was used to prepare Cd S@ZnO Core shell structure nanoarrays and Cd S/ZnS@ZnO Uniform hybrid nanoarray by controlling the concentration of reactants and the number of adsorption times;Subsequently,the electrochemical deposition method was used to prepare PPV/Cd S@ZnO core shell structure nanoarrays and PPV/(Cd S/ZnS)@ZnO homogeneous hybrid nanoarrays by controlling the applied voltage and growth time.Then,the structure of the nanoarray was systematically characterized: SEM and TEM were used to characterize the morphology of the nanoarrays;the content and distribution of nanoarray elements were analyzed by EDS;the surface elemental composition of the nanoarrays was characterized by XPS;XRD was used to characterize the crystal structure of nanoarrays;UV-Vis was used to characterize the spectral absorption range of the nanoarrays.Finally,the photoelectric detection performance of different component nanoarrays was tested and analyzed by using semiconductor parameter analyzer.