ZT Enhancement in Solution-Grown Sb(2−x)BixTe3 Nanoplatelets

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• 作者：Marcus Scheele ; Niels Oeschler ; Igor Veremchuk ; Klaus-Georg Reinsberg ; Anna-Marlena Kreuziger ; Andreas Kornowski ; José Broekaert ; Christian Klinke ; Horst Weller
• 刊名：ACS Nano
• 出版年：2010
• 出版时间：July 27, 2010
• 年：2010
• 卷：4
• 期：7
• 页码：4283-4291
• 全文大小：553K
• 年卷期：0
• ISSN：1936-086X

文摘

We report a solution-processed, ligand-supported synthesis of 15−20 nm thick Sb_(2−x)Bi_xTe₃ 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.