Sc ドープβ-菱面体晶ボロンにおける熱電特性の組成依存性

抄録

Thermoelectric properties of Sc-doped β-rhombohedral boron were examined in the temperature range of 373 K to 973 K. The electrical conductivity increased drastically by Sc doping. Positive Seebeck coefficient decreased because of an increase in the carrier concentration. In addition, the power factor enhanced from 0.013 μWm^－1K^－2 to 10 μWm^－1K^－2 at 673 K. The thermal conductivity reached the theoretical minimum lattice thermal conductivity of 2.3 Wm^－1K^－1 at 473 K by Sc doping. The maximum ZT value enhanced from 0.006 to 0.020 at 973 K for Sc_2.0B₁₀₅ as a p-type thermoelectric material.