Trans-trans-2,5-bis- [2-{5-(2,2'-Bithienyl)}ethenyl] thiophene: Synthesis, Characterization, Thin Film Deposition, and Fabrication of Organic Field Effect Transistors

Trans-trans-2,5-bis-[2-{5-(2,2'-Bithienyl)}ethenyl] thiophene (BTET) was synthesized and then purified in a gradient sublimation system. It was characterized using IR, UV-Vis and mass spectroscopy, and elemental analysis. BTET films were deposited with molecular beam deposition (MBD) or spin coating from solution. Insulated-gate field-effect transistor (IGFET) devices based on such films were used to study their electrical transport properties. A field effect mobility of 0.01 cm2 V-1 sec-1 was measured from films deposited with MBD, while the mobility of the spin-coated films was slightly above 0.0001 cm2 V-1 sec-1.