[20p-G204-1~5] 16.2 Energy Harvesting

[20p-G204-3] Study of thermoelectric energy filtering effects on n-type Bi₂Te₃

〇Hirofumi Hazama¹, Yumi Masuoka¹, Hidenari Yamamoto², Hiroyuki Suto², Yohei Kinoshita², Mamoru Ishikiriyama², Ryoji Asahi¹ (1.Toyota Central R&D Labs., 2.Toyota Motor Corporation)

Keywords:Thermoelectric material, energy filtering effect, nanocomposite

We endeavored to improve the power factor (PF) by inserting filter phases in an n-type Bi₂Te₃ bulk material. Ga₂Te₃ was selected as the filter phase by the first-principles calculations. We synthesized Bi₂Te₃ containing Ga₂Te₃ precipitates by carefully controlling the sintering and annealing temperatures, which followed the liquid-quenching process. Homogeneously dispersed nanosized Ga₂Te₃ improved PF. The enhancement in PF originates in the energy filtering effect of nanosized Ga₂Te₃.