| Abstract
| - Two soluble phthalocyanine derivatives, 2,9,16-tri(tert-butyl)-23-(10-hydroxydecyloxy) phthalocyanine (1)and 2,9,16-tri(tert-butyl)-23-(10-hydroxydecyloxy) copper phthalocyanine (2) were used as semiconductorlayers in organic thin-film transistors (OTFTs) based on their Langmuir−Blodgett (LB) films. From the π−Acurves, we can conclude that the phthalocyanine 1 and 2 molecules are in a titled arrangement at the air−water interface. The molecular ordering in the LB multilayer films on the SiO2 substrate was examined byusing UV−Vis absorption spectra and atomic force microscopy (AFM). The highest occupied molecularorbital and the lowest unoccupied molecular orbital were determined, and the energy band diagram of theirOTFTs can be deduced by the cyclic voltammetric measurements. The LB films of phthalocyanine 1 and 2were subsequently made into p-channel field-effect transistors, which were generally operated in the enhancedmode. The channel mobilities of phthalocyanine 1 and 2 were calculated to be about 4.8 × 10-5 cm2 V-1 s-1and 4.0 × 10-4 cm2 V-1 s-1, respectively.
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