Protection of MoO_3 high work function by organic thin film

摘要

The effects of air exposure are investigated for molybdenum trioxide (MoO_3) covered with organic thin films using ultraviolet photoemission spectroscopy. It is found that the severe drop of the work function of MoO_3 by air exposure is substantially reduced by the organic thin films. Both CuPc and C_(60) are used for the investigations. The results indicate that the MoO_3 surface can be passivated by approximately two monolayers of organic thin films against exposure to air.