Abstract
Although a large number of Zintl compounds have shown high thermoelectric efficiency, a very few n-type compounds are reported. Here, we use theoretical models based on Boltzmann transport formalism to determine the electrical and phonon transport properties of Potassium Antimonide (KSb) and Potassium Bismutide (KBi). Electron–phonon scattering rate is calculated based on simple model of Deformation potential and compared with the mode-dependent scattering rates by using Born approximation. The results of the two models are in good agreement. The lattice thermal conductivity is found as 0.83 Wm−1K−1 for KSb and 0.52 Wm−1K−1 for KBi at room temperature. The obtained maximum value of thermoelectric figure of merit (ZT) is 0.96 for KSb and 0.78 for KBi at 600 K by tuning the carrier concentration and temperature reveal these two n-type materials can be used as efficient thermoelectric materials.
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