Zinc phthalocyanine (ZnPc) is an organic p-type semiconductor, whose molecule is a conjugated multicontour system. In order to obtain photovoltaic devices, the costly method of vacuum deposition of ZnPc thin film semiconductors was replaced by the drop casting deposition from solutions. This method allowed the obtaining of Schottky diodes by solution processes with photovoltaic parameters of open circuit voltage and short circuit current density higher than in the case when obtained with thermal vacuum evaporation. In addition, this method is harmless to body and environment, much cheaper and exclude working with toxic substances.