Electron and phonon transmission in diameter-modulated nanowires
- Conference date: 28–30 September 2011
- Location: Thessaloniki, Greece
Recently, we proposed diameter-modulated nanowires as candidates for enhanced thermoelectric energy conversion efficiency. We have shown that high optimal thermoelectric figure of merit can be achieved due to the modification of the electron transmission coefficient compared to that in uniform straight wires. We have also calculated the phonon transmission coefficient. The transport coefficients have then been calculated from the electron and phonon transmission coefficients. Here, we present our results on the thermoelectric transport properties of the electrons and phonons in diameter-modulated nanowires. In periodically modulated wires, the figure of merit has found to increase with the number of periods. After a small number of periods, it saturates to the infinite superlattice value. The enhancement of the figure of merit is favored by the decrease of the phonon conductance, κ ph . A significant decrease of κ ph has been obtained for non-periodically modulated nanowires. Disorder favors the decrease of κ ph but at the same time limits the electron conductance. It is, however, shown that disorder-induced enhancement of the figure of merit is possible.
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