The surface topography and density of unoccupied electronic states at thermal deposition of ultra-
thin dibromo-bianthracene films on the ZnO surface have been studied. The electronic characteristics of
unoccupied electronic states during growth of dibromo-bianthracene films to a thickness of 10 nm have been
investigated by total current spectroscopy using a probe electron beam. The experimental dependences have
been analyzed using theoretical calculation of the orbital energies for dibromo-bianthracene molecules by the
method of density functional theory (DFT).