FORMATION OF TTF-TCNQ CHARGE-TRANSFER COMPLEX IN COEVAPORATED FILMS

We have investigated the formation process of charge-transfer (CT) com plex and the electric conductivity of TTF-TCNQ co-evaporated films by varying the growth temperature (T-g). The molar ratio of TTF to TCNQ i n the co-evaporated film is constant at a value of 1.0 in the T-g rang e between 31 degrees C and 42 degrees C. The formation of the single c rystal of the CT complex is enhanced and the electric conductivity inc reases with T-g. The temperature dependence of the surface conductivit y is explained by the combination of the single-crystalline conduction of the grains and the activation-type conduction of the amorphous pha se between the grains.