ELECTRICAL CHARACTERIZATION OF DIODES BASED ON REGIOREGULAR POLY(3-HEXYLTHIOPHENE)

Conjugated polymer films were sandwiched between thin aluminium and go ld electrodes in order to determine current-voltage characteristics of the three-layer device. Poly(3-hexylthiophene) fractions different in their degrees of polymerization were used as the representatives of c onjugated systems with different chain lengths. The analysis of the da ta showed that morphology of the: polymer film and length of the chain influence the operation voltage of the device. Moreover, due to the p osition of the Fermi levels of the electrodes and HOMO (LUMO) levels, the device works in single-carrier current regime and space-charge lim itation of current is present. (C) 1998 Elsevier Science S.A. All righ ts reserved.