Engineered Molecular Layers For Organic Electronic Applications: A Confocal Scanning Raman Spectroscopy (CSRS) Investigation

Abstract

We present CSRS maps of magnetically modified vanadyl phthalocyanine (VOPc) thin films forming conduction channels in organic field‐effect transistors (OFETs). The VOPc films with a nominal thickness of about 100 nm were produced by organic molecular beam deposition in high vacuum. During the growth conditions the substrates were exposed to a magnetic field (B) from a bar magnet. The CSRS maps revealed significant changes of the organic fields upon preparation conditions. The highest field effect mobility, electrical current and anisotropy of the CSRS‐topography is achieved in layers grown with B parallel to the substrate plane, while intermediate and lowest values are achieved in devices grown with B perpendicular to the substrate and without, respectively.