Morphology of thin pentacene layers deposited on polycrystalline Co films.
(a) Valence band photoemission spectra at the pentacene-cobalt interface; (b) close up into the spectral region around HOMO for small amounts of pentacene; (c) secondary electron cutoff part of the UPS spectra.
Gas phase UPS spectrum of pentacene (top) together with UPS spectra of thin films of pentacene. The thickness of the pentacene layers are indicated. The UPS spectrum of Co was subtracted from the spectrum.
Shifts of the molecular levels for different layers of pentacene, with respect to those of a thick pentacene layer. The levels labeled “a” and “b” are defined in Fig. 2(a).
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