Enhanced thermoelectric performance of Mg3Sb2-xBix thermoelectric thin films through carrier concentration modulation by Bi alloying

Epitaxial growth of high-quality Mg3Sb2 thin films on annealed c-plane Al2O3 substrates and their thermoelectric properties

“…18) In fact, Mg 3 Sb 2 -based bulk materials exhibit a high thermoelectric performance comparable to that of Bi 2 Te 3 -based materials, which were previously considered the best-performing materials at around RT. 19) Thin films of Mg 3 Sb 2 have also been extensively studied, 20,21) with a sputtered Mg 3 Sb 2 thin film exhibiting a power factor of about 0.11 μW cmK −2 . 22) It has also been reported that the power factor increases in thin films fabricated by MBE due to band convergence by strain control.…”

“…3. Figures 3(a) and 3(b) show the Seebeck coefficient (S) and power factor (S 2 σ) as a function of electrical conductivity (σ), where other reported values of Mg 3 Sb 2 thin films fabricated by MBE 24) or sputtering [20][21][22] are also plotted. The values in this study, indicated by the red circles on the graph, show notably higher S at the same σ compared to other Mg 3 Sb 2 thin films.…”

“…This study provides valuable insight into enhancing the performance and development of other Zintl phase compounds grown on c-Al 2 O 3 , and Mg 3 Sb 2 -based highperformance thin-film thermoelectric materials. Other reported values of Mg 3 Sb 2 thin films fabricated by MBE 24) or sputtering [20][21][22] are shown by open marks. Black dashed lines in (a) and (b) are guides to the eye.…”

“…Thermoelectric properties of Mg 3 Sb 2 thin films at room temperature. σ dependences of (a) S and (b) S 2 σ, and the p dependences of (c) S and (d) μ.Other reported values of Mg 3 Sb 2 thin films fabricated by MBE24) or sputtering[20][21][22] are shown by open marks. Black dashed lines in (a) and (b) are guides to the eye.…”