The authors would like to thank Prof. Dr. Dr. h. c. mult. A. Simon for enabling the TEM experiments and Christin Szillus for the FIB preparation. Financial support by the DFG in the frame of the priority program SPP1386 “Nanostructured Thermoelectric Materials” is gratefully acknowledged.
In Situ TEM Investigations on Thermoelectric Bi2Te3/Sb2Te3 Multilayers†
Article first published online: 21 OCT 2011
Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Engineering Materials
Volume 14, Issue 3, pages 139–143, March 2012
How to Cite
Schürmann, U., Winkler, M., König, J. D., Liu, X., Duppel, V., Bensch, W., Böttner, H. and Kienle, L. (2012), In Situ TEM Investigations on Thermoelectric Bi2Te3/Sb2Te3 Multilayers. Adv. Eng. Mater., 14: 139–143. doi: 10.1002/adem.201100209
- Issue published online: 5 MAR 2012
- Article first published online: 21 OCT 2011
- Manuscript Revised: 15 SEP 2011
- Manuscript Received: 2 AUG 2011
In this work, the impact of heat treatment on the real structure of Bi2Te3/Sb2Te3 multilayers is investigated. The material was heated in situ in the transmission electron microscope (TEM) and ex situ inside a furnace after preparing these layers with the so-called nanoalloying deposition technique via molecular beam epitaxy (MBE) equipment. The samples were prepared as a lamella for TEM studies using focused ion beam technique. EDX elemental mapping and high angle annular dark field mode-STEM were performed to monitor changes of the morphology and interdiffusion phenomena after heating up to 250 °C. A grain growth started during heating and the chemical layer structure was smeared out partly but remained in several grains and was found to be adjusted parallel to a major lattice plane in a crystallite. High resolution TEM shows polysynthetic twinning in a number of crystals.