Author:
YZ Pei，J Yang，LD Chen，W Zhang，JR Salvador，...
Abstract：
Heavy elements filling have been considered the most effective way to improve the thermoelectric performance of caged compounds such as CoSb(3) by reducing k(L). Here, we show an opposite example of filling a light element, Na, into CoSb(3) for obtaining high thermoelectric figure of merit ZT.ZT=1.25 at 850 K for Na(0.48)Co(4)Sb(12) is one of the highest values among all reported single-element-filled CoSb(3). The Na-filling scatters phonons less effectively but it results in relatively high mobility thus large power factor. This most likely comes from the extra electronic states near the Fermi level induced by Na.
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