Study on Semiconductor Material Bismuth Telluride

How do you define property in Bismuth Telluride

Bismuth Telluride is a powder of gray with the molecular formula Bi2Te3. Bismuth Telluride is a semiconductor substance that has high thermal conductivity and good electrical conductivity. Bismuth Telluride poses a very low risk but it is still possible to be fatal when ingested in large quantities. The material is able to allow electrons on its surface to move at room temperatures without energy consumption. This will increase chip’s operating speed, and can even improve computer chip work efficiency.

Which preparation techniques are used to prepare Bismuth telluride?

Many common uses can be made of bismuth telluride powder material. Preparation methods that are most commonly used include: single crystal pulling, Bridgeman method or zone melting.

1. This is the zone melting method. It allows single crystal growth by melting and crystallizing polycrystalline ingots. This creates a rod-shaped ingot made of polycrystalline crystals. After melting the area in which the ingot lies, the remaining ingot remains solid. A molten region is then moved down the length of each ingot until the remainder of it is melted again.

2. Bridgman Method: Also known as the “crucible descending” method, it is one of the most common methods for crystal growth. You place the crystal-growing material into a cylindrical vessel and let it slowly go through a heat furnace. The furnace temperature should not be higher than that of the crystal. Once the temperature in the furnace is slightly higher than the melting temperature, crystals will melt. The temperature at the bottom, which is the center of the furnace’s heat, drops first. This is most suitable for common alkali and alkaline ionic compounds.

3. Czochralski technique: It was invented by Chukraski in 1917 and used to make single crystals of high quality. You need to first place the crystal material into the crucible. After the crystal has melted completely, heat the Crucible. Next, pull out the crystal material from the melting liquid. Under proper temperature control the remaining seed crystals are constantly rearranged and become crystals.
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