| Autor: |
Yoshino, Harukazu, Nakada, Haruki, Krivickas, Sara J., Mori, Hatsumi, Anyfantis, George C., Papavassiliou, George C., Murata, Keizo |
| Zdroj: |
Physica Status Solidi (C); May2012, Vol. 9 Issue 5, p1193-1195, 3p |
| Abstrakt: |
Electrical resistivity φ and thermopower S were measured for novel τ -type organic conductors τ -(EDT- S, S -DMEDT-TTF)2(AuBr2)1+ y and τ -(ETO- R, R -DMEDT-TTF)2(AuBr2)1+ y to explore highly efficient organic thermoelectric materials. Electrical resistivity is nonmetallic below room temperature for both the materials in contrast to τ -(EDO- S, S -DMEDT-TTF)2(AuBr2)1+ y that shows metallic resistivity and the highest dimensionless thermoelectric figure of merit ZT = 0.042 in organic crystals so far. On the other hand, it was found that S of these materials are very similar to one another in temperature dependence as well as in magnitude. The sign of S is negative and | S | shows maximum of about 130 µV · K-1 at 125 and 150 K for the EDT- S, S -DMEDT-TTF and ETO- R, R -DMEDT-TTF salts, respectively. Thermal conductivity κ was also measured for the latter material. It was found that κ is about 1 W · K-1 · m-1 and weakly dependent on temperature. Combining these transport coefficients as ZT = S2 T / φκ the maximum of ZT is obtained as 0.044 at 190 K for the ETO- R, R -DMEDT-TTF salt. This is the highest ZT in organic molecular conductors. (© 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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