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 (κ) 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 κ can be well modeled using non-symmetric strain relaxation applied to the model of the series of thermal resistances.
Highlights
Thermoelectric modules based on half-Heusler compounds offer a cheap and clean way to create eco-friendly electrical energy from waste heat
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 cross-plane thermal conductivity measured at room temperature for the series of samples with the structure Tn:H6−n, where 0 n 6 uc and several models of κ described in detail in the main text and the supplementary material.[33] show that the limits for single films (n = 6 and 0 for TiNiSn and HfNiSn, respectively) are consistent with the previously reported experimental values,[9,11] within experimental uncertainty
Summary
Thermoelectric modules based on half-Heusler compounds offer a cheap and clean way to create eco-friendly electrical energy from waste heat.
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