Preparation and evaluation of phthalocyanine/vanadium oxide field-effect transistors

Field-effect transistors were prepared with magnesium phthalocyanine (MgPc) and vanadium pentoxide (V₂O₅). Vapor treatments of several organic solvents were carried out for MgPc thin films. The UV-vis absorption spectra, surface morphologies, X-ray diffraction patterns were largely changed with the treatments. The FET characteristics were also improved by the treatments and dichloromethane treatment induced the largest improvement. Furthermore, V₂O₅ film, which is used as carrier generation layer in organic light-emitting diodes, were inserted in the FET and the FET characteristic was changed. The vapor treatment and V₂O₅ insertion should be used for controlling FET performance.