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

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