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Low Temperature Synthesis as a Route for Highly Thermoelectric Efficient Na‐Doped PbTe

In this work, Na‐doped PbTe is synthesized through a low temperature synthesis technique. This method provides highly efficient p‐type PbTe using a synthesis temperature much lower than the PbTe melting point and as low as 430 °C followed by sintering at 600 °C. A maximum ZT of 1.36 at 720 K is achieved for the Pb0.98Na0.02Te sample arising from a high power factor and a very low lattice thermal conductivity. The low thermal conductivity is attributed to the in situ nanostructuring achieved by the low temperature synthesis method, followed by cold pressing and sintering.