Electrical conductivity and thermoelectric power in crystals of tetrathiotetracene iodide

Abstract

Temperature dependences of electrical conductivity and of thermoelectric power in quasi-one-dimensional organic crystals of tetrathiotetracene iodide were calculated in a large temperature interval. Two electron-phonon interaction mechanisms: one of deformation potential type and other similar to that of polaron were considered. The scattering of carriers on impurities and on crystal defects was also taken into account. It is found that the presented crystal model describes rather well the temperature dependences in the interval from 300K up to ~ 150 K and can be applied for the modeling of thermoelectric properties. For lower temperature the calculated electrical conductivity grows faster, meaning that additional scattering mechanisms begin to be important.