Synthesis and Thermal Instability of High-Quality Bi2Te3/Sb2Te3 Super lattice Thin Film Thermoelectrics

被引：41

作者：

Hansen, Anna-Lena ^{[1
]}

Dankwort, Torben ^{[2
]}

Winkler, Markus ^{[3
]}

Ditto, Jeffrey ^{[4
,5
]}

Johnson, Dave C. ^{[4
,5
]}

Koenig, Jan D. ^{[3
]}

Bartholome, Kilian ^{[3
]}

Kienle, Lorenz ^{[2
]}

Bensch, Wolfgang ^{[1
]}

机构：

[1] Univ Kiel, Inst Inorgan Chem, D-24118 Kiel, Germany

[2] Univ Kiel, Inst Mat Sci, D-24143 Kiel, Germany

[3] Fraunhofer Inst Phys Measurement Tech IPM, D-79110 Freiburg, Germany

[4] Univ Oregon, Dept Chem, Eugene, OR 97403 USA

[5] Univ Oregon, Inst Mat Sci, Eugene, OR 97403 USA

来源：

CHEMISTRY OF MATERIALS | 2014年 / 26卷 / 22期

基金：

美国国家科学基金会;

关键词：

GE-SI ALLOYS; BOUNDARY SCATTERING; DIFFUSION; PHONONS; SB2TE3; CONDUCTIVITY; FIGURE; BI2TE3; MERIT;

D O I：

10.1021/cm5031574

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The quality and temperature stability of 1 nm Bi2Te3/5 nm Sb2Te3 superlattices prepared by molecular beam epitaxy for the first time was investigated by in situ and ex situ X-ray diffraction and transmission electron microscopy. Upon heating, the superlattice structures are not stable against interdiffusion of the components, with micro- and nanostructural changes occurring at temperatures as low as 200 degrees C. The interdiffusion preferably starts next to superlattice defects. At 300 degrees C the Bi2Te3 and Sb2Te3 layers were mostly interdiffused, forming the thermodynamically stable Sb1.66Bi0.33Te3 alloy. The data suggests that structural integrity of Bi2Te3/Sb2Te3 superlattices will not be stable for extended times above 200 degrees C, thus inhibiting application of such superlattices over a wide temperature range.

引用

页码：6518 / 6522

页数：5

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