Mobility in Tetrathiafulvalene-Tetracyanoquinodimethane (TTF-TCNQ)

Abstract

I account for the magnitude and temperature dependence of the mobility of TTF-TCNQ in the range 150-300 K by scattering of the carriers by optical phonons derived from the symmetric molecular vibrations. The only adjustable parameters are the widths of the conduction bands on TCNQ and TTF chains, chosen as 3000 and 1500 K, respectively. I also obtain estimates of the coupling to acoustic phonons and the unbroken chain lengths by fitting conductivity data down to 70 K.