Overview of Supply 99.999% Sb2Te3 Antimony Telluride
Telluride and selenide compounds play a significant role in the field of semiconductors, particularly in the development of advanced electronic and optoelectronic devices. These materials belong to the chalcogenide family, characterized by their ability to form compounds with elements from groups IV-VI in the periodic table.
Tellurides: Compounds containing tellurium (Te) as the chalcogen. Examples include cadmium telluride (CdTe), mercury telluride (HgTe), and zinc telluride (ZnTe). These materials have found applications in solar cells, infrared detectors, and high-speed electronics due to their tunable bandgap, high electron mobility, and good thermal stability.
Selenides: Similar to tellurides, but with selenium (Se) replacing tellurium. Notable examples are cadmium selenide (CdSe), gallium selenide (GaSe), and zinc selenide (ZnSe). Selenide compounds are widely used in light-emitting diodes (LEDs), laser diodes, and solar cells due to their direct bandgap properties and efficient light absorption/emission capabilities.
Feature of Supply 99.999% Sb2Te3 Antimony Telluride
Direct Bandgap: Many telluride and selenide semiconductors have direct bandgaps, which facilitate efficient light emission and absorption processes. This makes them suitable for optoelectronic applications such as LEDs and lasers.
Tunable Bandgap: The bandgap of these materials can be adjusted by alloying or altering the composition (e.g., CdSe to CdTe), enabling customization for specific device requirements across a wide spectrum of wavelengths.
High Electron Mobility: Materials like HgCdTe exhibit high electron mobility, which is crucial for high-speed electronic devices and low-noise detector applications.
Thermal Stability: Some tellurides and selenides, like ZnTe and ZnSe, demonstrate good thermal stability, making them suitable for high-temperature operation and processing.
Non-Toxic Alternatives: With increasing environmental concerns, there’s a push towards exploring less toxic alternatives to commonly used semiconductors. For instance, Cd-based tellurides and selenides are being replaced or combined with less toxic elements like Mg or Mn in some applications.
(Supply 99.999% Sb2Te3 Antimony Telluride)
Parameters of Supply 99.999% Sb2Te3 Antimony Telluride
Antimony Telluride (Sb2Te3), also known as tellurium-vanadium or gray antimony telluride, is a ternary chalcogenide semiconductor with exceptional thermoelectric properties. It has gained significant attention in recent years due to its potential applications in waste heat recovery, electronic cooling, and next-generation power generation devices. Here are some key parameters of Sb2Te3 that contribute to its unique characteristics:
1. Crystal structure: Sb2Te3 crystallizes in a rhombohedral lattice system, specifically in the α-phase, which is a zincblende-related structure. The unit cell consists of an antimony atom sandwiched between two tellurium atoms, forming a three-dimensional network.
2. Composition: The stoichiometry is approximately 2 parts of antimony (Sb) to 3 parts of tellurium (Te), although slight variations can occur depending on the purity and processing conditions.
3. Bandgap: Sb2Te3 exhibits a narrow bandgap, typically around 0.2 to 0.3 eV, which makes it a p-type semiconductor. This small energy difference between valence and conduction bands allows for efficient thermoelectric conversion.
4. Thermoelectric properties: Sb2Te3 is renowned for its high Seebeck coefficient, a measure of voltage generated per temperature gradient. Values around 800 to 1000 μV/K are common, making it one of the highest for room-temperature thermoelectrics. Its high figure of merit (ZT), which combines Seebeck coefficient, electrical conductivity, thermal conductivity, and temperature, can reach up to 1.5 at elevated temperatures.
5. Electrical conductivity: While the Seebeck coefficient is high, Sb2Te3’s electrical conductivity can be relatively low, particularly at room temperature. However, this can be improved by alloying or nanostructuring, which enhances charge carrier mobility.
6. Thermal conductivity: A key challenge for thermoelectric materials is minimizing thermal conductivity. Sb2Te3 has a moderate intrinsic lattice thermal conductivity, which can be further reduced by introducing grain boundaries or phonon scattering centers.
7. Processing and synthesis: Sb2Te3 can be synthesized through various methods, including chemical vapor transport (CVT), solid-state reactions, and melt-growth techniques. High purity materials require strict control over reaction conditions and purification steps.
8. Stability and durability: Sb2Te3 is generally stable under ambient conditions but can degrade over time when exposed to moisture or air, which affects its performance. Encapsulation and protective coatings are essential for practical applications.
9. Applications: Potential applications for Sb2Te3 include waste heat recovery systems, thermoelectric generators, and Peltier coolers. It is also being explored for use in electronic cooling devices, where its high thermoelectric efficiency could reduce energy consumption.
10. Research and development: Ongoing research focuses on optimizing Sb2Te3’s properties, such as discovering new compositions and structures, to achieve even higher ZT values and improve device performance.
In summary, Sb2Te3 is a promising thermoelectric material with a unique combination of properties that make it suitable for advanced energy conversion technologies. However, continuous improvements in synthesis techniques and understanding of its fundamental mechanisms are crucial for unlocking its full potential in real-world applications.
(Supply 99.999% Sb2Te3 Antimony Telluride)
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