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Anisotropic layered Bi2Te3-In2Te3 composites: control of interface density for tuning of thermoelectric properties
Authors: D. Liu, X. Li, P.M. de Castro Borlido, S. Botti, R. Schmechel, and M. Rettenmayr
Ref.: Sci. Rep. 7, 43611 (2017)
Abstract: Layered (Bi1−xInx)2Te3-In2Te3 (x = 0.075) composites of pronounced anisotropy in structure and thermoelectric properties were produced by zone melting and subsequent coherent precipitation of In2Te3 from a (Bi1−xInx)2Te3 (x > 0.075) matrix. Employing solid state phase transformation, the Bi2Te3/In2Te3 interface density was tuned by modifying the driving force for In2Te3 precipitation. The structure-property relationship in this strongly anisotropic material is characterized thoroughly and systematically for the first time. Unexpectedly, with increasing Bi2Te3/In2Te3 interface density, an increase in electrical conductivity and a decrease in the absolute Seebeck coefficient were found. This is likely to be due to electron accumulation layers at the Bi2Te3/In2Te3 interfaces and the interplay of bipolar transport in Bi2Te3. Significantly improved thermoelectric properties of Bi2Te3-In2Te3 composites as compared to the single phase (Bi1−xInx)2Te3 solid solution are obtained.
Citations: 9 (Google scholar)
DOI: 10.1038/srep43611
Bibtex:
@article{Liu_2017,
doi = {10.1038/srep43611},
url = {https://doi.org/10.1038%2Fsrep43611},
year = 2017,
month = {mar},
publisher = {Springer Science and Business Media {LLC}},
volume = {7},
number = {1},
author = {Dongmei Liu and Xinzhong Li and Pedro Miguel de Castro Borlido and Silvana Botti and Roland Schmechel and Markus Rettenmayr},
title = {Anisotropic layered Bi2Te3-In2Te3 composites: control of interface density for tuning of thermoelectric properties},
journal = {Scientific Reports}
}