Significantly enhanced thermoelectric properties of p-type Mg3Sb2 via co-doping of Na and Zn

Co-doping Na and Zn into thermoelectric compound Mg3Sb2 simultaneously improves all the thermoelectric transport properties, electrical conductivity σ, Seebeck coefficient S and reduced thermal conductivity κ, thus leading to significantly higher ZT of ∼0.8 at 773 K, a 33 % improvement. Importantly, greatly improved power factor in the whole measured temperature range, i.e., 300% at 323 K and 15% at 773 K, respectively, leads to not only the highest average power factor but also the highest output power density for p-type Mg3Sb2.283