A STUDY OF STRUCTURAL FEATURES AND CHARGE CARRIER MOBILITY IN TETRAFLUORO-SUBSTITUTED COBALT PHTHALOCYANINE FILMS

We present a comparative study of structural features and charge carrier mobilities in the films of cobalt phthalocyanine with F-substituents in peripheral (CoPcF4-p) and non-peripheral positions of the phthalocyanine ring (CoPcF4-np). The films are prepared by thermal sublimation in a vacuum. It is shown by powder X-ray diffraction and atomic force microscopy that polycrystalline films CoPcF4-p and CoPcF4-np with a preferential crystallite orientation relative to the substrate surface are formed upon the deposition. Despite the fact that the CoPcF4-np film has a higher crystallinity than the CoPcF4-p film, the transistor based on the former demonstrates a two orders lower charge carrier mobility than that of the latter.