INFLUENCE OF CRYSTAL-STRUCTURE ON CARRIER TRANSPORT IN TITANYLPHTHALOCYANINE THIN-FILMS

Titanylphthalocyanine (TiOPc) thin films were prepared by vacuum depos ition at various substrate temperatures, and influence of crystallinit y of the films on the carrier mobility was studied, The film crystalli nity was evaluated by X-ray diffraction, TEM, SEM and STM observation. The carrier mobility perpendicular to the film plane was determined b y time-of-flight method. Polycrystalline and amorphous films were obta ined at the substrate temperatures of above 20 degrees C and below 0 d egrees C, respectively. It was confirmed. that the crystallinity of th e TiOPc thin films increased with an increase in substrate temperature . The carrier mobility of the TiOPc thin films increased with an incre ase in substrate temperature, which could be explained by an increase in crystallinity.