Evaporated thin films of tetrathiafulvalene derivatives and their charge-transfer complexes

Thin films of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF), dimethyl- a nd trimethyl-TTF have been prepared using the thermal evaporation technique . The films were investigated using electron/optical microscopy, optical ab sorption spectroscopy and d.c. electrical measurements. A maximum in-plane, d.c. room temperature conductivity of 1.6 +/- 0.6 S cm(-1) was noted for i odine-doped films of BEDT-TTF. The thermal activation energy, over the rang e 77-300 K, was 0.028 +/- 0.02 eV for this material. (C) 1998 Elsevier Scie nce S.A. All rights reserved.