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• W2257844351 abstract "Energy filtering of charge carriers in a semiconducting matrix using atomically coherent nanostructures can lead to a significant improvement of the thermoelectric figure of merit of the resulting composite. In this work, several half-Heusler/full-Heusler (HH/FH) nanocomposites with general compositions Zr0.25Hf0.75Ni1+xSn1−ySby (0≤x≤0.15 and y=0.005, 0.01 and 0.025) were synthesized in order to investigate the behavior of extrinsic carriers at the HH/FH interfaces. Electronic transport data showed that energy filtering of carriers at the HH/FH interfaces in Zr0.25Hf0.75Ni1+xSn1−ySby samples strongly depends on the doping level (y value) as well as the energy levels occupied by impurity states in the samples. For example, it was found that carrier filtering at HH/FH interfaces is negligible in Zr0.25Hf0.75Ni1+xSn1−ySby (y=0.01 and 0.025) composites where donor states originating from Sb dopant dominate electronic conduction. However, we observed a drastic decrease in the effective carrier density upon introduction of HH/FH interfaces for the mechanically alloyed Zr0.25Hf0.75Ni1+xSn0.995Sb0.005 samples where donor states from unintentional Fe impurities contribute the largest fraction of conduction electrons. This work demonstrates the ability to synergistically integrate the concepts of doping and energy filtering through nanostructuring for the optimization of electronic transport in semiconductors." @default.
• W2257844351 created "2016-06-24" @default.
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• W2257844351 date "2016-02-01" @default.
• W2257844351 modified "2023-10-17" @default.
• W2257844351 title "Distribution of impurity states and charge transport in Zr0.25Hf0.75Ni1+Sn1−Sb nanocomposites" @default.
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• W2257844351 doi "https://doi.org/10.1016/j.jssc.2015.11.035" @default.
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