Camel-back band-induced power factor enhancement of thermoelectric lead-tellurium from Boltzmann transport calculations

被引：14

作者：

Wang, X. G. ^{[1
]}

Wang, L. ^{[1
]}

Liu, J. ^{[1
]}

Peng, L. M. ^{[1
]}

机构：

[1] Univ Sci & Technol China, Sch Engn Sci, Dept Modern Mech, Key Lab Mech Behav & Design Mat, Hefei 230026, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2014年 / 104卷 / 13期

关键词：

PHONON-SCATTERING; HIGH-PERFORMANCE; VALENCE-BAND; PBTE; MERIT; FIGURE; NANOSTRUCTURES; SUPERLATTICES; CONVERGENCE; STATES;

D O I：

10.1063/1.4870494

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Band structures of PbTe can be abnormally bended via dual-doping on both the cationic and anionic sites to form camel-back multivalley energy band structures near the band edge. As a result, additional carrier pockets and strong intervalley scattering of carriers are introduced. Boltzmann transport calculations indicate that their contradictory effects yield remarkably enhanced power factor due to the improved thermopower and almost unchanged electrical conductivity in low temperature and high carrier concentration ranges. These findings prove dual-doping-induced band bending as an effective approach to improve the thermoelectric properties of PbTe and other similar materials. (C) 2014 AIP Publishing LLC.

引用

页数：5

共 46 条

[1]

Ashcroft N., 2011, Solid State Physics

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