An attempt to measure simultaneously molecular orientation and current–voltage characteristics in thin films

Abstract

To investigate the relationship between molecular orientation and current voltage ( J– V) characteristics, molecular orientation and J– V characteristics have been simultaneously measured in some indium tin oxide (ITO)/X/Al structures. X were thin films fabricated from poly(3-hexylthiophene) (P3HT), coumarin6 dispersed in poly( N-vinylcarvazole), or biomolecular hemin (Hm). The results have shown that the orientation change of the P3HT chain causes a reproducible loop of the J– V characteristics in P3HT thin film, and that the peak observed in the J– V characteristics in Hm is associated with irreversible molecular orientation change.