Improving the thermoelectric properties of Bi2Te2.7Se0.3 through La2O3 dispersion.

Theoretically, nanosecond phase dispersion is an effective method to optimize the performance of thermoelectric materials due to the energy filtering effect and strong phonon scattering. Because of the chemical stability of La₂O₃, it may be used as a second phase material in Bi₂Te_2.7Se_0.3 matrixes. After the introduction of La₂O₃, its electric transport performance decreases slightly, but its thermal transport performance increases further. Finally, its thermoelectric performance is optimized. At 455 K, the maximum dimensionless thermoelectric figure of merit (ZT) value of Bi₂Te_2.7Se_0.3 + 0.5 wt% La₂O₃ reaches 0.97. The experimental results demonstrate that La₂O₃ dispersion can improve the thermoelectric properties of Bi₂Te_2.7Se_0.3 effectively_. [ABSTRACT FROM AUTHOR]