Preparation method of zinc selenide polycrystalline material for single crystal growth

Abstract

The invention discloses a preparation method of a zinc selenide polycrystalline material for single crystal growth. The zinc selenide polycrystalline material is prepared from blocky zinc and blocky selenium of which the purities are over 99.999 percent as raw materials in an electronic-grade quartz ampoule. The preparation method comprises the following steps: removing impurities on the inner wall of the ampoule; feeding the zinc and the selenium in a molar ratio of (1.0-1.05):1.0 into the ampoule; feeding a reaction promoter of which the volume concentration is 3-12mg.cm<-3> into the ampoule; evacuating the ampoule, sealing the ampoule, horizontally standing the ampoule in a tube furnace, and quickly raising the temperature to between 94 and 1,000 DEG C; and after maintaining the temperature, cooling the ampoule to a room temperature to generate a large amount of high-purity zinc selenide polycrystalline powder. The zinc selenide polycrystalline powdery material prepared by the invention has the components of Zn and Se, with high purity of over 99.999 percent, in a ratio of 1.0:(1.0-1.03), and can be directly used as a growing raw material of a zinc selenide single crystal. The preparation method has the advantages of simple process, low cost and wide application range.

Description

1. Technical field

[0001] The invention belongs to the field of photoelectric materials, in particular to a method for preparing a zinc selenide polycrystalline material used for single crystal growth. 2. Background technology

[0002] Zinc selenide (ZnSe) crystal is a II-VI wide bandgap compound semiconductor material. Due to its excellent physical and chemical properties, it is widely used in blue light semiconductor light-emitting devices, nonlinear optoelectronic devices, nuclear radiation detection devices and near-ultraviolet-visible light detection devices. Devices have important application prospects. Since the growth of zinc selenide single crystal is very sensitive to impurities, the commonly used preparation methods of zinc selenide single crystal include melt method, high temperature solution method, solid phase recrystallization method and vapor phase growth method, all of which require a purity of up to 99.999%. The above zinc selenide polycrystalline raw mate...