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

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 interd...

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Published in:Chemistry of materials 2014-11, Vol.26 (22), p.6518-6522
Main Authors: Hansen, Anna-Lena, Dankwort, Torben, Winkler, Markus, Ditto, Jeffrey, Johnson, Dave C, Koenig, Jan D, Bartholomé, Kilian, Kienle, Lorenz, Bensch, Wolfgang
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container_end_page 6522
container_issue 22
container_start_page 6518
container_title Chemistry of materials
container_volume 26
creator Hansen, Anna-Lena
Dankwort, Torben
Winkler, Markus
Ditto, Jeffrey
Johnson, Dave C
Koenig, Jan D
Bartholomé, Kilian
Kienle, Lorenz
Bensch, Wolfgang
description 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 °C. The interdiffusion preferably starts next to superlattice defects. At 300 °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 °C, thus inhibiting application of such superlattices over a wide temperature range.
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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 °C. The interdiffusion preferably starts next to superlattice defects. At 300 °C the Bi2Te3 and Sb2Te3 layers were mostly interdiffused, forming the thermodynamically stable Sb1.66Bi0.33Te3 alloy. 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title Synthesis and Thermal Instability of High-Quality Bi2Te3/Sb2Te3 Superlattice Thin Film Thermoelectrics
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