Preparation And Characterization Of Different ZnSe Structure Morphology

Zinc selenide?ZnSe?is an important semiconductor material.Due to the characteristics of band gap structure and band gap width,ZnSe has the characteristics of high light transmitta nce and low light absorption coefficient.It has important applications in optical devices and electrica l devices.Usual y it used as window material of solar cel,optical detectors,the material of blue light optical devices,infrared optical devices and biomedical fluorescent labeling materials.There are many preparation methods of zinc selenide,including hydrothermal method,chemical vapor deposition,molecular beam epitaxy and electrochemical deposition method.In recent years,zinc selenide material has become a hot research material.Many researchers are devoted to the improvement of preparation methods and the application of zinc selenide in various devices.Material characterization is an important method to analyze the morphology and structure of materials.In this paper,the experiment mainly uesd transmission electron microscope,scanning electron microscope,X-ray diffraction,energy dispersive spectroscopy and infrared spectrum to analyze material.A series of characterization methods make the analysis of materials more detailed and accurate,and provide a basis for making more perfect materials.In this paper,ZnSe was prepared by different preparation methods.And the different morphology of ZnSe was characterized and analyzed.The main contents are as follows:?1?ZnSe was prepared by hydrothermal method.NaHSe was prepared by Na₂SeO₃ solution that providing selenium source.Precursor of zinc was prepared by reacting with C₅H₉NO₃S?NAC?and zinc acetate.ZnSe was obtained by reacting with the precursor of Zn and NaHSe.The effects of reaction time,the ratio of Zn to Se and the molar ratio of zinc acetate to NAC on the experimental results were analyzed by using the control variable method.When the reaction time was 60 minutes,the ratio of Se to Zn was 1:4,and the ratio of zinc acetate to NAC was 1:1.2,the spherical ZnSe that had uniform distribution and size could be obtained.The infrared spectrum analysis showed that there were NAC and ZnS on the surface of ZnSe.The analysis of UV absorption spectrum showed that the size of ZnSe was very smal,which leaded to the blue shift of the spectrum.?2?ZnSe was prepared by high temperature solid phase method.The mixture of zinc oxide,zinc sulfide and selenium powder was put into a high temperature reaction furnace.The mixture is starting reaction by a set program that it can control the change of temperature.Because of the difference of temperature?650?-800??and reaction time,there are dendrites,spheres,flakes,rings and quantum dots.Through the subsequent characterization analysis,it was found that the purity of ZnSe was not high in the experiment.After the energy spectrum analysis,it was found that the product was lack of selenium.After analysis,it is speculated that the melting point of selenium is low and the air tightness of the reaction vessel is not good enough.It needs to be heated in a vacuum environment or a completely closed vessel filled with reactants to obtain a better purity ZnSe product.?3?ZnSe nanospheres were prepared by vacuum thermal evaporation for the first time.ZnSe nanospheres were obtained by thermal evaporation of ZnSe with 99.99%purity in a vacuum of1*10^-44 Torr.As a control group,ZnSe nanospheres were also prepared by thermal evaporation of the mixture of selenium powder and zinc selenide powder in the same environment.Experime nt analyzed the spherical diameter of two kinds of ZnSe nanospheres,and calculated the sphericity of two kinds of ZnSe nanospheres.It is found that the shape of ZnSe nanospheres prepared by thermal evaporation of ZnSe with selenium powder is more uniform and the diameter of the nanospheres prepared by thermal evaporation of ZnSe with selenium powder is smaler.The sphericity of the nanospheres is closer to 1 than that obtained by thermal evaporation of pure ZnSe.