Thermoelectric properties of a thermoelectric module made of TTT2I3 and TTT(TCNQ)2 organic crystals

Abstract

In this study, we conduct a comprehensive examination of the thermoelectric characteristics observed in crystals of TTT2I3, which exhibit p-type behavior, and TTT(TCNQ)2, functioning as an n-type conductor. These crystals have demonstrated adjustable thermoelectric properties by controlling the stoichiometry of charge carriers and impurity concentrations. TTT2I3 crystals, structured with alternating layers of tetrathiotetracene and iodide, display effective charge transport along the primary crystallographic axis. Similarly, TTT(TCNQ)2 shares the layeredarchitecture of TTT2I3 but with electron conductivity facilitated by TCNQ chains. In this investigation, we developed a theoretical model incorporating electron-phonon interactions and impurity scattering to analyze transport and thermoelectric characteristics.