The effect of magnesium added at C-60/Rubrene heterointerfaces

Abstract

This study examines the effect of adding magnesium (Mg) at Codrubrene heterointerfaces by using synchrotron-radiation photoetnission spectroscopy. The heterointerface was obtained by depositing C-60 on a 4-angstrom Mg/rubrene surface. The photoemission spectra showed that the added Mg preferentially interacts with and transfers negative charges to C-60. The interfacial dipole potential was significantly enlarged, as was the separation between the lowest unoccupied molecular orbital of C-60 and the highest occupied molecular orbital of rubrene. The results demonstrate that the addition of Mg should be an effective method for improving the efficiency of light- and current-generating devices. (C) 2013 AlP Publishing LLC.