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

Hansen, Anna-Lena, Dankwort, Torben, Winkler, Markus, Ditto, Jeffrey, Johnson, Dave C., Koenig, Jan D., Bartholome, Kilian, Kienle, Lorenz and Bensch, Wolfgang (2014) Synthesis and Thermal Instability of High-Quality Bi2Te3/Sb2Te3 Super lattice Thin Film Thermoelectrics. Chemistry of Materials, 26 (22). pp. 6518-6522.

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Abstract

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.

Document Type: Article
Additional Information: Times Cited: 0 0
Research affiliation: Kiel University > Kiel Marine Science
OceanRep > The Future Ocean - Cluster of Excellence
Kiel University
Refereed: Yes
ISSN: 0897-4756
Projects: Future Ocean
Date Deposited: 30 Mar 2015 12:18
Last Modified: 05 Apr 2018 10:38
URI: http://oceanrep.geomar.de/id/eprint/27706

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