The Preparation And Study Of Physical Nature On Graphene-based HgCdTe Composite Films

Mercury cadmium telluride (Hg1-xCdxTe, MCT) is an infrared material withexcellent spectral sensitivity. It can give a sensitive response to the wavelength ofinfrared light from0.7to25mdepending on the different proportion of Hg and Cdin the MCT film. In view of its excellent spectral sensitivity, MCT thin films havebeen widely used for high performance infrared focal plane arrays (IRFPA) detectordevices in guidance, reconnaissance and resource exploration. With the developmentof the third generation of IRFPA, there is an increasing need for new detectormaterials with low cost and high performance. However, the performance of IRFPAdetector is restricted to low optical-electrical conversion efficiency of infraredmaterial due to its high resistance and low carrier mobility. So it is extremelyimportant to develop a new way to improve the photoelectric conversion properties ofthe MCT detector. Graphene is a two-dimensional nano material with single layercarbon atoms. Because of its high transmittance of~97%on infrared light andextraordinary carrier mobility of up to1.5105cm2v-1s-1, the graphene has beenregarded as the most promising material for transparent electrodes. Moreover,graphene natural flat structure is compatible with manufacturing technology ofsemiconductor devices.In this study,the The graphene-based HgCdTe composite films were grown byCVD and LMBE.And the various physical properties of composite films wereanalyzed in detail.The main contents were as follows:1. A brief introduction of the research progress and significance of HgCdTematerials.2. A brief introduction of preparation methods of the graphene and HgCdTe films.The theory and characteristics of laser molecular beam epitaxy (LMBE) andchemical vapor deposition (CVD) are introduced in detail.3. The graphene-based HgCdTe composite films were grown by LMBE and CVD,the influence of graphene layer on HgCdTe films were studied.4. The composite films were analysed by scanning electron microscopy (SEM),X-ray diffraction spectrum (XRD), infrared transmission spectrum and Hall effect.The Au-based HgCdTe films were compared with graphene-based HgCdTecomposite films, and analysed the influence of graphene.