Thermoelectric properties of Bi2Te3/Sb2Te3 superlattice structure

被引：30

作者：

Yamasaki, I ^{[1
]}

Yamanaka, R ^{[1
]}

Mikami, M ^{[1
]}

Sonobe, H ^{[1
]}

Mori, Y ^{[1
]}

Sasaki, T ^{[1
]}

机构：

[1] Sharp Corp, Energy Convers Lab, Shinjo, Nara 6392198, Japan

来源：

XVII INTERNATIONAL CONFERENCE ON THERMOELECTRICS, PROCEEDINGS ICT 98 | 1998年

关键词：

D O I：

10.1109/ICT.1998.740354

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Recently, it has been proposed that the use of superlattice structure is effective for reduction of lattice thermal conductivity in the direction perpendicular to superlattice interfaces which can lead to improvement of figure of merit. In this work, we have evaluated the thermal conductivity of Bi2Te3 and Sb2Te3 superlattice structure films. Pulsed laser deposition (PLD) has been employed as film formation method because it can easily make superlattice structure by ablating targets alternately. Bi2Te3 and Sb2Te3 films were grown respectively and effects of substrate temperature and laser power density on crystallinity, morphology and composition were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDX). Bi2Te3/Sb2Te3 superlattice structure films were grown with superlattice-periods of 10nm, 20nm and 80nm. Thermal conductivities were measured in the direction perpendicular to superlattice interfaces by a novel method specially developed by our group. We compared the thermal conductivities of Bi2Te3/Sb2Te3 superlattice structure films with that of Bi2Te3 single film. The results indicates that the involvement of superlattice structure into thermoelectric film is effective for the reduction of thermal conductivity and moreover, thermal conductivity becomes smaller as superlattice-period becomes shorter as predicted.

引用

页码：210 / 213

页数：4