期刊
ACS NANO
卷 5, 期 11, 页码 8541-8551出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn2017183
关键词
nanostructured solids; thermoelectrics; core-shell nanoparticles; colloids; thermal conductivity; phonon-glass electron-crystal
类别
资金
- Studienstiftung des deutschen Volkes
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.
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