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Advanced Materials, Volume 24, Issue 37, pages 5065–5070, September 25, 2012.
Yichi Zhang, Tristan Day, Matthew L. Snedaker, Heng Wang, Stephan Kramer, Christina S. Birkel, Xiulei Ji,
Deyu Liu, G. Jeffrey Snyder, Galen D. Stucky.
Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California, 93106, USA.
Materials Science, California Institute of Technology, Pasadena, California, 91106, USA.
Materials Department, University of California-Santa Barbara, Santa Barbara, California, 93106, USA.
Abstract
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.
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