Large-diameter cadmium telluride or cadmium zinc telluride polycrystalline rod synthesis device and preparation method

Abstract

The invention discloses a large-diameter CdTe or CdZnTe polycrystalline rod synthesis apparatus and a preparation method thereof. The apparatus is characterized in that an aspirating hole is arranged at the bottom of a graphite crucible, a graphite pad is placed at the bottom of the graphite crucible, a graphite cover is positioned at the mouth of the graphite crucible, the whole graphite crucible is placed in a quartz crucible and has a corresponding gap with a quartz plug, and the quartz plug is positioned at the mouth of the quartz crucible. The quartz crucible and the quartz plug are sealed through welding by adopting oxyhydrogen flame; the obtained quartz crucible is sent to a synthesis furnace and is heated to realize a raw material synthesis technology in order to prepare CdTe or CdZnTe polycrystalline rods; and the graphite crucible is completely sealed in the quartz crucible to make the solid material in graphite crucible in a high vacuum state at normal temperature, so the violent release and the heat impact of latent heat in a raw material mixture chemical-combination process can be effectively born during the heating synthesis, the frequent-appearing quartz crucible explosion or cracking event is completely avoided in the highly-pure raw material mixture synthesis process, and the highly pure graphite crucible can be repeatedly used, thereby the batch production cost is reduced.

Description

technical field [0001] The invention belongs to the field of semiconductor material preparation, and in particular relates to a large-diameter cadmium telluride (CdTe) or cadmium zinc telluride (CdZnTe) polycrystalline rod synthesis device and preparation method. Background technique [0002] CdTe and CdZnTe crystal materials can be used to make high-performance X-ray and γ-ray detectors due to their high resistivity and good carrier transport characteristics, and have broad application prospects in the fields of high-energy physics and medical imaging; they can also be used to make low- Low-cost CdTe thin-film solar cells require polycrystalline synthetic materials and CdTe targets; not only that, but its lattice constant matches the infrared detector material mercury cadmium telluride (HgCdTe), which is the most ideal epitaxial substrate for mercury cadmium telluride crystal materials , plays an indispensable role in modern infrared detector technology. [0003] In the pr...

AI Technical Summary

Problems solved by technology

This synthetic method is complex and costly, and is not suitable for large-scale production

[0006] At present, there is no satisfactory synthesis and preparation technology in the relevant literature and patents, which can synthesize and prepare large-diameter CdTe and CdZnTe polycrystalline rods simply, quickly, and at low cost, and can completely avoid explosion or cracking during synthesis. Pipe phenomenon for large-scale continuous production

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