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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 (Bi_1−xIn_x)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 (Bi_1−xIn_x)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 (Bi_1−xIn_x)₂Te₃ solid solution are obtained.

Citations: 14 (Google scholar)

DOI: 10.1038/srep43611

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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}
}