Characterization of α-sexithienyl thin films deposited by OMBD (organic molecular beam deposition) technique

α-sexithiethyl (α-6T) thin films were deposited by Organic Molecular Beam Deposition (OMBD) technique. The α-6T was synthesized and purified by the sublimation method. The thin films of the α-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 α-6T films were investigated with polarized electronic absorption spectroscopy. The molecules in the α-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 (~90°C) showed higher conductivity than the film deposited at room temperature