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Dimensionless thermoelectric figure of merit $ZT$ is investigated fortwo-dimensional organic conductors $\tau-(EDO-S,S-DMEDT-TTF)_2(AuI_2)_{1+y}$,$\tau$-(EDT-S,S-DMEDT-TTF)_2(AuI_2)_{1+y}$ and$\tau$-(P-S,S-DMEDT-TTF)_2(AuI_2)_{1+y}$ ($y \le 0.875$), respectively. The$ZT$ values were estimated by measuring electrical resistivity, thermopower andthermal conductivity simultaneously. The largest $ZT$ is 2.7 $\times$ 10$^{-2}$at 155 K for $\tau-(EDT-S,S-DMEDT-TTF)_2(AuI_2)_{1+y}$, 1.5 $\times$ 10$^{-2}$at 180 K for $\tau-(EDO-S,S-DMEDT-TTF)_2(AuI_2)_{1+y}$ and 5.4 $\times$10$^{-3}$ at 78 K for $\tau-(P-S,S-DMEDT-TTF)_2(AuI_2)_{1+y}$, respectively.Substitution of the donor molecules fixing the counter anion revealedEDT-S,S-DMEDT-TTF is the best of the three donors to obtain larger $ZT$.

Thermoelectric figure of merit of tau-type conductors of several donors