The interface electronic structure of Au on LiF coated tris(8-hydroxyquinoline) aluminum (Alq) has been investigated using x-ray and ultraviolet photoemission spectroscopies. It is found that initial Au depositions introduce small shifts of energy levels toward higher binding energy, and subsequent Au depositions reverse the shifts. As the Au coverage increases, the energy level positions eventually reach those of the pristine Alq. The reversal is attributed to the p doping by Au that compensates for any possible Li release.
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Ding et al. (2007) studied this question.
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