Bismuth Telluride (Bi₂Te₃) Sputtering Targets
Purity: 99.999% Size: 6” Thickness: 0.250”
Sputtering is a versatile and reliable method for depositing thin films from a wide variety of materials onto diverse substrate shapes and sizes. The process is highly repeatable and scalable, suitable for small research projects as well as medium-to-large production batches. Chemical reactions can occur on the target surface, in-flight, or on the substrate depending on process parameters. While sputter deposition involves many variables, it offers precise control over film growth and microstructure.
Applications of Sputtering Targets
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Thin Film Deposition: Material is eroded from a target and deposited onto substrates such as silicon wafers.
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Semiconductor Etching: Sputter etching is employed when high anisotropy is needed and selectivity is not a concern.
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Analytical Techniques: Secondary ion mass spectrometry (SIMS) measures the concentration and identity of sputtered atoms, detecting even trace impurities.
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Space Applications: Sputtering contributes to space weathering, altering the physical and chemical properties of airless bodies like asteroids and the Moon.
Bismuth Telluride in Thin Films
Bismuth telluride (Bi₂Te₃) is a gray semiconductor compound of bismuth and tellurium. Alloyed with antimony or selenium, it becomes an efficient thermoelectric material used for refrigeration and portable power generation. Bi₂Te₃ is also a topological insulator, exhibiting thickness-dependent physical properties.
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Thermoelectric Devices: Bi₂Te₃-based alloys are commonly used in bulk thermoelectric (TE) devices operating near ambient temperature.
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Thin Film Applications: Nanostructured Bi₂Te₃ thin films are gaining attention for chip-scale micro-coolers for thermal management of high-power micro/nano-electronics and flexible micro-power generators for energy harvesting.
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Enhanced Performance: Advances in nanotechnology have significantly improved thermoelectric efficiency in thin films with well-ordered structures, surpassing bulk material performance.
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Research Considerations: Composition, microstructure, morphology, thickness, stress-strain, and substrate conditions strongly influence the thermoelectric properties of Bi₂Te₃ thin films.
