Characterization of alpha-sexithienyl thin films deposited by OMBD (Organic Molecular Beam Deposition) technique

Abstract

alpha-sexithiethyl(alpha-6T) thin films of the were deposited by Organic Molecular Beam Deposition(OMBD) technique The alpha-6T was synthesized and purified by the sublimation method. The thin films of the alpha-6T were deposited under various deposition conditions. The effects of deposition rate, substrate temperature, and vacuum pressure on the formation of these films have been studied. The molecular orientations of alpha-6T films were investigated with the polarized electronic absorption spectroscopy. The molecules in the alpha-6T film deposited at a low deposition rate under a high vacuum were aligned almost perpendicular to the substrate. The film deposited at an elevated substrate temperature (similar to-90 degrees C) showed higher conductivity than the film deposited at room temperature.