Dissertation > Industrial Technology > General industrial technology > Industrial common technology and equipment > Thin-film technology

Study of Electrochemistry Co-deposition ZnSe Films and Mechanism of Inhibiting Hydrogen Evolution

Author ZhangChengGuang
Tutor LiuChuanShao;ZuoJuan
School Henan Polytechnic University
Course Materials Processing Engineering
Keywords electrochemistry co-deposition ZnSe film stoichiometry ratio inhibiting hydrogen evolution
Type Master's thesis
Year 2007
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ZnSe is important and eximious II - VI semiconductor luminescent material, which has the direct transition energy structure, the band gap energy (2.7eV), the wide band diaphanous scope (0.5~22μm), the higher luminous efficiency, the lower absorption coefficient and so on merits, which is one kind optimal material of preparation visible light emitter, applied on shines the bluish green semiconductor diode , the photolumin- escence and the electroluminescence instrument, the laser and the thin film solar cell and so on, therefore, the ZnSe thin film always is the research hot spot. First, according to the electrochemistry principle, theoretically elaborated two kinds of or two kind of above elements electrochemistry co-deposition the principle, and the dependent relations of the ZnSe thin film ingredient and the electrochemistry the parameter (PH value,ratio of ion density, electric current density , complexing agent, temperature and time) has carried on the theoretical analysis, for building the foundation to obtained the ZnSe film material. Then, designing electrochemistry co-deposition the experimental plan as well as the electrochemistry co-deposition the equipment, with stainless steel as anode materials and copper as cathode materials carrying on the ZnSe thin film series experiments in zinc sulfate and in the selenite sodium electrolyte solution, in order to further studying the thin film ingredient and the appearance influence of electrochemistry co-deposition the parameter, and making use of the orthogonal testing methods , which are PH value,ratio of ion density, electric current density , complexing agent, temperature and time, carried on further than the research, obtained the best electrochemistry co-deposition parameter. With the spectrophotometer, the scanning electron microscope (SEM), X beam energy scattering analysis (EDAX) and the X- beam diffraction meter (XRD) , carrying on analyzing and testing the thin film ingredient, the appearance and the structure, the stoichiometry ratio of ZnSe films is close to 1:l and this ZnSe films are polycrystals thin film. The cathode, which restrains hydrogen, is the research focal point in the electrochemistry co-deposition, discussing the mechanism of cathode inhibiting hydrogen evolution in this article. The research of cathode polarization curvilinear had indicated that, in the ZnSe hydrogen aggradation potential is bigger, which can inhibit the hydrogen evolution, at the same time, because of the sp3 hybridization track existence, which enable the covalent crystal the characteristic in the ZnSe crystal, made the hydrogen atom not to be easier to adsorb.

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