Langmuir–Blodgett film of new phthalocyanine containing oxadiazol groups and its application in field-effect transistor

A new phthalocyanine, tetra-{4-[5-(4-tert-butyl-phenyl)-[1,3,4]oxadiazol-2-yl]-phenoxy}-zincphthalocyanine (TOPc) was synthesized and its Langmuir–Blodgett (LB) film was fabricated and characterized by ultraviolet–visible (UV–vis) absorption and polarized UV–vis absorption spectra. The results show that the tilt angle of TOPc molecules on substrate is about 32°. Field-effect transistor incorporating with LB film of TOPc as a semiconductor layer was fabricated. A mobility of 1.1 × 10−4 cm2 V−1 s−1 and an on/off ratio up to 103 have been achieved.