Thermoelectric Properties of Lead Chalcogenide Core–Shell Nanostructures

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• 作者：Marcus Scheele ; Niels Oeschler ; Igor Veremchuk ; Sven-Ole Peters ; Alexander Littig ; Andreas Kornowski ; Christian Klinke ; Horst Weller
• 刊名：ACS Nano
• 出版年：2011
• 出版时间：November 22, 2011
• 年：2011
• 卷：5
• 期：11
• 页码：8541-8551
• 全文大小：1207K
• 年卷期：0
• ISSN：1936-086X

文摘

We present the full thermoelectric characterization of nanostructured bulk PbTe and PbTe–PbSe samples fabricated from colloidal core–shell nanoparticles followed by spark plasma sintering. An unusually large thermopower is found in both materials, and the possibility of energy filtering as opposed to grain boundary scattering as an explanation is discussed. A decreased Debye temperature and an increased molar specific heat are in accordance with recent predictions for nanostructured materials. On the basis of these results we propose suitable core–shell material combinations for future thermoelectric materials of large electric conductivities in combination with an increased thermopower by energy filtering.