[17a-F102-1~12] 9.4 Thermoelectric conversion

[17a-F102-1] Sample Dependence of Thermoelectric Figure of Merit of Quasi-One-Dimensional Organic Conductor (TTT)₂I_3+δ (δ < 0.1)

〇Harukazu Yoshino¹, Akifumi Hasegawa¹, Natsuki Kuroda¹, Rika Tanaka², Masatoshi Kozaki¹ (1.Osaka City Univ. (S), 2.Osaka City Univ. (E))

Keywords:organic conductor, thermoelectric figure of merit, power factor

We report the sample dependence of thermoelectric properties of quasi-one-dimensional organic conductor (TTT)₂I_3+δ. We obtained the largest values of dimensionless thermoelectric figure of merit ZT and power factor PF as 0.033 at 300 K and 730 μW K^-2 m^-1 at 54 K, respectively. It was found that the thermopower shows large sample dependence and even its sign changes at room temperature. We will discuss the reason of much smaller ZT than the theoretically predicted value >2 and origin of the large sample dependence of the thermopower.