[5a-A503-1~5] 9.4 Thermoelectric conversion

▲ [5a-A503-3] Thermoelectric properties of Al-based ternary chalcopyrites: TAlTe₂ (T = Cu, Ag)

〇(PC)Seongho Choi¹, Ken Kurosaki^2,3, Manabu Inukai¹, Fumihiro Nakamori², Yuji Ohishi², Hiroaki Muta², Shinsuke Yamanaka^2,4, Tsunehiro Takeuchi^1,3 (1.Toyota Tech. Inst., 2.Osaka Uni, 3.JST-PRESTO., 4.Fukui Uni.)

Keywords:chalcopyrites, Aluminum, conductivity

Recently we demonstrated that Ga-based ternary chalcopyrite materials, TGaTe₂ (T = Cu, Ag) have excellent thermoelectric properties, such as the very low lattice thermal conductivity below 0.7 Wm^-1K^-1 at 900 K.² This small lattice thermal conductivity of CuGaTe₂ allowed us to obtain a very large value of dimensionless figure of merit zT exceeding 1.4. In this study, we employed Al as a substitute for Ge because it is abundant and hence much cheaper than Ga. We also considered that it might cause a widening of band gap to increase the value of Seebeck coefficient S, power factor PF, and zT.