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Electronic Structure of Bismuth Telluride

What is Bismuth Telluride?

Bismuth Telluride is a narrow gap-layered semiconductor with high thermal conductivity. Recent research has confirmed that bismuth telluride may significantly increase the speed of microchips and be the basis for the emerging next-generation technology known as "Spintronics." American Elements Bismuth Telluride products are generally available in most volumes and can be purchased in bulk. American Elements can produce most materials in high purity and ultra-high purity (up to 99.99999%) forms and follows applicable ASTM testing standards; a range of grades are available, including Mil Spec (military grade), ACS, Reagent and Technical Grade, Food, Agricultural and Pharmaceutical Grade, Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia). We can also produce materials to custom specifications by request, in addition to custom compositions for commercial and research applications and new proprietary technologies. Typical and custom packaging is available, as is additional research, technical, and safety (MSDS) data. Please get in touch with us above for information on specifications, lead time, and pricing.

 

Structure and Chemistry of Bismuth Telluride

Bismuth telluride Bi2Te3 and Sb2Te3, and Bi2Se3 crystallize in the tetradymite crystal structure shown in Figure 1. The coordination of Bi and Te is octahedral, much like Pb and Te in the lead chalcogenide IV–VI semiconductors having the rock salt structure. The slightly less electronegative Bi compared to more electronegative Te justifies the association of valence as Bi+3 (s2p0) and Te−2. Like rock salt PbTe, the large Te−2 anions of Bi2Te3 form a close-packed layer with cations (Bi+3 in Bi2Te3 or Pb+2 in PbTe) in octahedral holes. While rock salt PbTe has an FCC cubic packing of close-packed Te layers, Bi2Te3 has a hexagonal HCP arrangement of Te layers. 

 

Electronic Structure of Bismuth Telluride

Coupled with its inherently low lattice thermal conductivity, Bi2Te3 is an excellent thermoelectric because of its complex electronic band structure, which has been explored extensively by experimental and theoretical studies. Although the semiconducting electronic structure of Bi2Te3 can be explained using simple valence rules, spin–orbit interactions complicate the band structure giving Bi2Te3 exceptional electronic properties. The band structure of Bi2Te3 can be qualitatively understood by considering only the interactions of the valence p-states of both atoms within the quintuple layer. The valence s and p levels in Bi and Te have significant enough separation that sp-hybridization is weak. The van der Waals interaction between the Te(1) atoms between neighboring quintuple layers is essentially nonbonding and contributes close to the top of the valence band. At the same time, the Te-bonding states are generally lower in energy. The filled or lone pair Bi-s states of Bi+3 are further below in the valence band and do not contribute to the top of the valence band, unlike the Pb+2 s-states in lead chalcogenides. The conduction bands are comprised primarily of unfilled antibonding p-states of Bi used in bonding with Te. Two bonding and two antibonding states exist between the Bi and Te atoms for each nonbonding state on the Te(1) atoms. The slightly polar nature of the bonding makes the Bi atoms somewhat positively charged while the Te atoms are negatively charged, with the Te(1) atoms more negative than the Te.

 

Price of Bismuth Telluride

Bismuth Telluride particle size and purity will affect the product's Price, and the purchase volume can also affect the cost of Bismuth Telluride. A large amount of large amount will be lower. The Price of Bismuth Telluride is on our company's official website.

 

Bismuth Telluride supplier

Mis-Asia is a reliable and high-quality global chemical material supplier and manufacturer. It has over 12 years of experience providing ultra-high quality chemicals and nanotechnology materials, including Bismuth Telluride, nitride powder, graphite powder, sulfide powder, and 3D printing powder. If you are looking for high-quality and cost-effective Bismuth Telluride, you are welcome to contact us or inquire at any time.

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