CHARACTERIZATION OF THIN-FILMS OF CHLOROALUMINUM PHTHALOCYANINE ON MOS2 - HREELS, LEET AND PIES STUDY

High-resolution electron energy loss spectra (HREELS), low-energy elec tron transmission spectra (LEET) and Penning ionization electron spect ra (PIES) were measured for thin films of chloroaluminum phthalocyanin e (ClAlPc) deposited on a cleaved MoS2 surface in order to investigate the molecular orientation and aggregation in the monolayer range. It was found that the as-grown film of monolayer equivalence consists of ClAlPc islands and the substrate surface is not fully covered by the m olecules. Upon heating the film, the molecules spread over the substra te surface to form a uniform monolayer with a flat-he orientation, whe re the Cl atoms protrude outside the film. (C) 1998 Elsevier Science S .A. All rights reserved.