Quasi-epitaxial growth of quaterthiophene thin films by organic molecular beam deposition

A study of thin films of quaterthiophene grown by organic molecular beam de position on different substrates under highly controlled growth conditions is presented. Polarized absorption measurements reveal a complete macroscop ic orientation of the films deposited on potassium acid phtalate (KAP) sing le crystals. X-ray diffraction measurements have been performed on films de posited on different substrates and the results interpreted in relation wit h the optical properties. Epitaxial growth is demonstrated for the films de posited on KAP combining the results of optical and structural analysis. (C ) 2000 Elsevier Science S.A. All rights reserved.