This report presents the results of investigations carried out on polymer- and low-weight molecular materials prepared in the form of thin films by various methods, namely the thermal vacuum evaporation, chemical vapour deposition and spin-coating. The influence of the technological conditions on the structure, surface morphology and electronic properties of selected organic thin films, including polyazomethines, phthalocyanines and perylene derivatives, as well as their blends, is discussed from the point of view of the potential applications for photovoltaic organic devices.