Thermoelectric Properties of Tl-Doped SnSe: A Hint of Phononic Structure

被引：0
|
作者：
V. Kucek
T. Plechacek
P. Janicek
P. Ruleova
L. Benes
J. Navratil
C. Drasar
机构：
[1] University of Pardubice,Faculty of Chemical Technology
[2] Joint Laboratory of Solid State Chemistry of IMC AS CR Prague and University of Pardubice,undefined
来源：
Journal of Electronic Materials | 2016年 / 45卷
关键词：
Semiconductors; chalcogenides; x-ray diffraction; transport properties; thermoelectric properties;
D O I：
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中图分类号：
学科分类号：
摘要：
Polycrystalline samples with composition Sn1−xTlxSe (for x = 0 to 0.04) have been synthesized from elements of 5 N purity at elevated temperatures. The phase purity of the products was verified by x-ray diffraction analysis. Samples for measurement of transport properties were prepared by hot pressing. The samples were then characterized by measurement of electrical conductivity, Hall coefficient, Seebeck coefficient, and thermal conductivity over the temperature range from 300 K to 725 K. All samples demonstrated p-type conductivity. Tl markedly enhanced the carrier concentration. We discuss the influence of Tl substitution on the free carrier concentration and thermoelectric performance. Investigation of the thermoelectric properties showed an order-of-magnitude improvement, with ZT reaching 0.6 at 725 K. We discuss the distinctive nature of the thermal conductivity of SnSe.
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页码：2943 / 2949
页数：6
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