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The Synthesis of ZnSe Crystals by Solvothermal Method

Author: DingWei
Tutor: XuBingShe
School: Taiyuan University of Technology
Course: Materials Processing Engineering
Keywords: ZnSe Solvothermal Ethylenediamine Triethanolamine Microspheres Plate-like structure
CLC: TN304
Type: Master's thesis
Year: 2010
Downloads: 87
Quote: 0
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Abstract


With the development of science and technology, nano semiconductor material due to its good optical, electrical and magnetic properties and potential application value, causing a wide range of research interests of scientists around the world. ZnSe material as a direct band gap Group II-VI semiconductor material, the bandgap of 2.67 eV, which procure ZnSe material widely used in the optical device, a solar cell, the piezoelectric material, the laser material and the humidity sensor. How to implement the regulation on the crystal structure of the nano-materials, dimensions, morphology, surface structure and the energy band structure in the synthesis process, will achieve the improvement of material properties provide experimental evidence for depth systematic study of material structure and properties of the relationship has important significance. Currently, the preparation method of the biosynthesis ZnSe material, solvothermal its equipment is simple, easy to operate and other advantages become more widely in the preparation of the ZnSe material synthesis means. In this thesis, using Solvothermal successfully synthesized two ZnSe micro-nano product: hollow micron spherical product and plate-like product; using field emission scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction instrument (XRD) X-ray energy dispersive spectroscopy (EDS), PL spectrometer instrument sample preparation, structural characterization and performance testing. Both growth mechanism of micro-nano product. (1) Se powder and ZnSO4 · 7H2O as the source material for the reaction medium, triethanolamine and H2O mixed solution as a reducing agent to KBH4 Solvothermal reaction at 170 ℃ for 48 hours were successfully prepared the sphalerite structure of ZnSe hollow microspheres, spherical shell thickness of less than 100nm. By studying the different reaction time, the role of water in the solvent, as well as the different SE source and the reaction process of factors such as bubbles KBH4 of ZnSe microns structure preliminary draw mechanism of the growth of ZnSe hollow microspheres. (2) Solvothermal ethylenediamine (EN) as a complexing agent, prepared the ZnSe plate sheet product to characterize the sample morphology and structure, that reacts ZnSe sheet product is dense packed hexagonal structure, a thickness of between 200-300nm, the preferred growth direction is [101? 0]. Binding reaction, the plate-like product growth mechanism of ZnSe. Furthermore, N2H4 · H2O ZnSe plate product was added during the reaction were analyzed.

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