A Mesoporous Anisotropic n-Type Bi2Te3 Monolith with Low Thermal Conductivity as an Efficient Thermoelectric Material

A Mesoporous Anisotropic n-Type Bi2Te3 Monolith with Low Thermal Conductivity as an Efficient Thermoelectric Material

A mesoporous Bi2Te3 monolith with ≈20% porosity is fabricated by hot‐pressing mesoporous powders. The mesostructures are able to transport carriers and scatter phonons efficiently. The reduction (≈60%) of the thermal conductivity is sufficient to compensate for the loss of electrical conductivity pe...

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Veröffentlicht in:Advanced Materials 2012-09, Vol.24 (37), p.5065-5070
Hauptverfasser: Zhang, Yichi, Day, Tristan, Snedaker, Matthew L., Wang, Heng, Krämer, Stephan, Birkel, Christina S., Ji, Xiulei, Liu, Deyu, Snyder, G. Jeffrey, Stucky, Galen D.
Format: Artikel
Sprache:eng
Schlagworte:
anisotropic materials
Bismuth - chemistry
bismuth telluride
Elasticity
mesoporous materials
Porosity
solar (photovoltaic), solid state lighting, phonons, thermoelectric, bio-inspired, energy storage (including batteries and capacitors), electrodes - solar, defects, charge transport, materials and chemistry by design, optics, synthesis (novel materials), synthesis (self-assembly), synthesis (scalable processing)
Tellurium - chemistry
Thermal Conductivity
thermoelectric materials
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Zusammenfassung:A mesoporous Bi2Te3 monolith with ≈20% porosity is fabricated by hot‐pressing mesoporous powders. The mesostructures are able to transport carriers and scatter phonons efficiently. The reduction (≈60%) of the thermal conductivity is sufficient to compensate for the loss of electrical conductivity perpendicular to the direction of applied pressure, leading to an enhanced zT of 0.7, highest among all reported self‐doped, n‐type Bi2Te3 at similar temperatures.
ISSN:0935-9648
1521-4095
DOI:10.1002/adma.201201974