Optoelectronic Performance Modulation Of ZnO/graphene Hybird Structure

ZnO has a wide range of applications in the construction of micro-lasers and heterojunction light-emitting devices because of its excellent luminescent properties,natural hexagonal resonators,good physical and chemical stability.In order to improve the lasing performance of ZnO,researchers introduce metal surface plasmon to enhance its luminous efficiency,and have achieved a series of research results.The surface plasmon of graphene which can be adjusted by doping and external electric field has a wider application prospect.At present,graphene surface plasmon have been used in the construction of terahertz,infrared waveguide devices,photodetection devices and so on.At the same time,the WGM microcavity of ZnO material can effectively enhance the interaction between light and matter,making a very sensitive response to the external signal,and therefore being a good medium for devices such as photoelectric detection and biosensors.In this thesis,ZnO micro-nanostructures and high-quality graphene samples were prepared by different methods.The photoelectric properties of ZnO and graphene hybrid structure were studied,mainly including the following three aspects:(1)ZnO micro and nanostructures with different morphologies were prepared by different methods.The optical field confinement and PL enhancement induced by graphene SP was investigated.(2)Metal A1 nanoparticles were introduced into the hybrid structure and the UV photoelectric properties of the composite system were studied.Al nanoparticles enhances the luminescence and detection performance of ZnO,and the stimulated emission of ZnO is 10 times enhanced under the same intensity of UV light.(3)ZnO/graphene hybrid structure with field effect modulation was fabricated,and the influence of the applied electric field on the luminescence performance of the hybrid structure was studied.