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The UPS spectra evolution as a function of Au thickness deposited on to the Cs-doped Alq film: (a) cutoff and (b) the HOMO region. The Fermi level derived from the Au substrate is drawn as a dashed line. It can be seen that the gap state caused by Cs doping disappeared as 1 Å Au is evaporated.
XPS spectra of C , Cs , and Au core level as a function of the Au thickness deposited on to the Cs-doped Alq film.
The energy level shifts as a function of Au coverage. The valence features as well as the C 1s of the undoped Alq film are shown as the first points of the curves.
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