Abstract
The surface potential across Alq3 [tris(8-quinolinolato)aluminum] evaporated films on a metal (Au, Al) electrode was measured by the Kelvin probe method and the results were discussed taking into account the orientational ordering of Alq3 molecules, the presence of surface charges on Alq3 films and the displacement of excess charge (electrons and holes) from the electrode into Alq3 films. The very large surface potential established in as-deposited Alq3 films was mainly due to the alignment of dipoles of Alq3 molecules, whereas the small surface potential that remained in the films after photoirradiation was due to excess charge. In order to clarify the drastic decrease of surface potential by photoirradiation, the surface potential decay was examined.
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