Abstract
We report the effect of Sb content in MgAg0.97Sbx (x = 0.99, 0.9925, 0.995, and 1.00) on output power and leg efficiency. Due to the doubling of carrier concentration with increasing the Sb content, power factor is enhanced around 20% over the whole temperature range. Simultaneously, the average thermoelectric figure of merit (ZT) is even enhanced a little in spite of the increased corresponding thermal conductivity. We further calculated the engineering power factor (PF)eng, output power, engineering figure of merit (ZT)eng and leg efficiency by taking into account of the Thomson effect. Assuming Tc = 300 K and Th = 548 K, leg length ∼2 mm, an output power of ∼1.77 W cm−2 and leg efficiency η of ∼10.1% are finally obtained for the optimized composition MgAg0.97Sb0.995.
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