University of Moldova


'The research activity of Technical University of Moldova group in the frame of H2ESOT project will be directed to the modeling of thermoelectric properties of p- and n-type quasi-one-dimensional (Q1D) organic crystals of tetrathiotetracene (TTT) derivatives, to the determination of optimal parameters in order to obtain the highest expected thermoelectric efficiency, to the elaboration of recommendations for the synthesis of such crystals. Earlier it was predicted that the highly conducting quasi-one-dimensional organic crystals on the base of strictly one-dimensional crystal model. The best thermoelectric parameters in this approximation are limited by the scattering of charge carriers on impurities and on structure defects. But the interchain interaction can also limit these parameters. Preliminary investigations in the frame of a simplified two-dimensional crystal model have shown that the interchain interaction has a little effect in the case of not very pure crystals, but becomes important in the case of purer crystals. Now it is necessary to elaborate a more complete physical model than has been used so far for Q1D organic crystals of TTT derivatives. More precise optimal crystal parameters that will correspond to highest expected values of the thermoelectric figure of merit ZT will be determined. On the base of new physical crystal model the electrical conductivity, Seebeck coefficient, the electronic thermal conductivity and the thermoelectric figure of merit ZT will be calculated for crystals with different degrees of purity and perfection in order to determine the optimal values and assist the experimental physics work with the aim of attaining the most suitable crystals.'



Prof. Dr. Anatolie Casian


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H2ESOT - FP7 funded project for Future Emerging Technologies • 2012