Electronic structure, transport, and phonons of SrAgChF (Ch = S, Se, Te): Bulk superlattice thermoelectrics

被引：40
|
作者：
Gudelli, Vijay Kumar [1 ]
Kanchana, V. [1 ]
机构：
[1] Indian Inst Technol Hyderabad, Dept Phys, Ordnance Factory Estate, Yeddumailaram 502205, Telangana, India
来源：
PHYSICAL REVIEW B | 2015年 / 92卷 / 04期
关键词：
PERFORMANCE; FIGURE; SCATTERING; MERIT; POWER; BA;
D O I：
10.1103/PhysRevB.92.045206
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report calculations of the electronic structure, vibrational properties, and transport for the p-type semiconductors, SrAgChF (Ch = S, Se, and Te). We find soft phonons with low frequency optical branches intersecting the acoustic modes below 50 cm(-1), indicative of a material with low thermal conductivity. The bands at and near the valence-band maxima are highly two-dimensional, which leads to high thermopowers even at high carrier concentrations, which is a combination that suggests good thermoelectric performance. These materials may be regarded as bulk realizations of superlattice thermoelectrics.
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页数：8
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