Polycrystal single-phase zinc telluride and preparation method thereof

Abstract

The invention relates to the field of photovoltaic power generation materials, in particular to polycrystal single-phase zinc telluride and a preparation method thereof. The preparation method comprises the following steps: mixing raw materials including zinc particles and tellurium particles, putting the mixture into a crucible, covering the crucible with a cover, and putting the crucible into a reaction kettle; vacuumizing, heating and preheating; introducing inert gas into the reaction kettle, and gradually heating and preserving heat; after cooling, taking out the crucible, carrying out ball milling on the deposited zinc telluride crystal block, putting into a mold, shaping, and then putting into a hot pressing furnace together with the mold; vacuumizing and preheating, introducing inert gas, raising the temperature, and applying pressure to the interior of the mold for heat preservation and pressure maintaining; and cooling, and vacuumizing in the cooling process to obtain zinc telluride. The high-purity zinc telluride is prepared by adopting the zinc particles and the tellurium particles which are low in cost and high in purity as raw materials, the cost is low, time is short, the yield is high, the high-purity zinc telluride is a polycrystal single-phase compound block which is combined together in a crystal form, the density is close to theoretical density, the purity is high, the resistance value is uniform, and the best semiconductor effect can be achieved in a semiconductor film layer for photovoltaic power generation.

Description

technical field [0001] The invention relates to the field of photovoltaic power generation materials, in particular to a polycrystalline single-phase zinc telluride and a preparation method thereof. Background technique [0002] In the semiconductor film layer of photovoltaic power generation, only the single-phase zinc telluride compound can achieve the best semiconductor effect. At present, the preparation method of zinc telluride in the prior art is to mix metal zinc powder and metal tellurium powder, form them by hot isostatic pressing, and then cut them. This method can only combine the two powders in the form of high pressure. Molding, pure zinc telluride crystal material cannot be obtained, and the hot isostatic pressing is expensive, and the particle size of the raw material zinc powder and metal tellurium powder is very small, and because the powder is very easy to damage the raw material itself during the production process cause pollution, so it is difficult to o...

AI Technical Summary

Problems solved by technology

At present, the preparation method of zinc telluride in the prior art is to mix metal zinc powder and metal tellurium powder, form them by hot isostatic pressing, and then cut them. This method can only combine the two powders in the form of high pressure. Molding, pure zinc telluride crystal material cannot be obtained, and the hot isostatic pressing is expensive, and the particle size of the raw material zinc powder and metal tellurium powder is very small, and because the powder is very easy to damage the raw material itself during the production process cause pollution, so it is difficult to obtain high-purity metal zinc powder and metal tellurium powder, especially metal zinc powder. At present, the purity of zinc powder is generally 99.5% to 99.9%, while the purity of tellurium powder is generally 99.9 to 99.99%. The price of metal zinc powder and metal tellurium powder with higher purity is higher, so it is difficult to obtain zinc telluride compound with a purity of 99.99% or higher by this method, the cost is high, and it is difficult to obtain a single-phase structure

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