Tuning the thermoelectric properties of a single-molecule junction by mechanical stretching
Literature Information
Alberto Torres, Renato B. Pontes, Antônio J. R. da Silva, Adalberto Fazzio
We theoretically investigate, as a function of the stretching, the behaviour of the thermoelectric properties – the Seebeck coefficient (S), the electronic heat conductance (κel) and the figure of merit (ZT) – of a molecule-based junction composed of a benzene-1,4-dithiolate molecule (BDT) coupled to Au(111) surfaces at room temperature. We show that the thermoelectric properties of a single molecule junction can be tuned by mechanic stretching. The Seebeck coefficient is positive, indicating that it is dominated by the HOMO. Furthermore, it increases as the HOMO level, which is associated to the sulphur atom, tends towards energies close to the Fermi energy. By modelling the transmission coefficient of the system as a single Lorentzian peak, we propose a scheme to obtain the maximum ZT of any molecular junction.
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Physical Chemistry Chemical Physics

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