Tailoring of the electrical and thermal properties using ultra-short period 
non-symmetric superlattices

Komar, Paulina; Chavez-Angel, Emigdio; Euler, Christoph; Balke, Benjamin; Kolb, Ute; Mueller, Mathis M.; Kleebe, Hans-Joachim; Fecher, Gerhard H.; Jakob, Gerhard

doi:10.1063/1.4954499

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Tailoring of the electrical and thermal properties using ultra-short period non-symmetric superlattices

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Fecher, Gerhard H.
Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Komar, P., Chavez-Angel, E., Euler, C., Balke, B., Kolb, U., Mueller, M. M., et al. (2016). Tailoring of the electrical and thermal properties using ultra-short period non-symmetric superlattices. APL Materials, 4(10): 104902, pp. 1-7. doi:10.1063/1.4954499.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002C-100E-5

Abstract

Thermoelectric modules based on half-Heusler compounds offer a cheap and clean way to create eco-friendly electrical energy from waste heat. Here we study the impact of the period composition on the electrical and thermal properties in non-symmetric superlattices, where the ratio of components varies according to (TiNiSn)(n:)(HfNiSn)(6-n), and 0 <= n <= 6 unit cells. The thermal conductivity (kappa) showed a strong dependence on the material content achieving a minimum value for n = 3, whereas the highest value of the figure of merit ZT was achieved for n = 4. The measured kappa can be well modeled using non-symmetric strain relaxation applied to the model of the series of thermal resistances. (C) 2016 Author(s).