1. ZT enhancement in solution-grown Sb(2-x)Bi(x)Te3 nanoplatelets
- Author
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Scheele, Marcus, Oeschler, Niels, Veremchuk, Igor, Reinsberg, Klaus-Georg, Kreuziger, Anna-Marlena, Kornowski, Andreas, Broekaert, Jose, Klinke, Christian, and Weller, Horst
- Subjects
Condensed Matter - Materials Science - Abstract
We report a solution-processed, ligand supported synthesis of 15-20 nm thick Sb(2-x)Bi(x)Te3 nanoplatelets. After complete ligand removal by a facile NH3-based etching procedure, the platelets are spark plasma sintered to a p-type nanostructured bulk material with preserved crystal grain sizes. Due to this nanostructure, the total thermal conductivity is reduced by 60 % in combination with a reduction in electric conductivity of as low as 20 % as compared to the bulk material demonstrating the feasibility of the phonon-glass electron-crystal concept. An enhancement in the dimensionless thermoelectric figure of merit of up to 15 % over state-of-the-art bulk materials is achieved meanwhile shifting the maximum to significantly higher temperatures., Comment: 8 pages, 5 figures
- Published
- 2011
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