Development of Single-Crystal OFETs Prepared on Well-Ordered Sapphire Substrates

Locally Resolved Core‐hole Screening, Molecular Orientation, and Morphology in Thin Films of Diindenoperylene Deposited on Au(111) Single Crystals

“…In particular, the larger full width at half maximum (FWHM) of the C 1s peak for the island (FWHM = 1.3 eV) indicates a different homogeneity/molecular packing with respect to the first layers on top of the substrate (FWHM = 1.2 eV). In addition, this effect, which is laterally resolved here, has been observed in the comparison monolayer versus multilayer with standard XPS 17–20. In our case it is again, as previously discussed for the core hole screening, related with the local morphology of the film, i.e., layer versus island.…”

“…Comparing the signal of the C 1s core levels of the island and the monolayer, a 0.4 eV shift toward the higher binding energy is clearly observable. This effect is analogous to the shift found comparing monolayers and multilayers with standard XPS 17, 18. It is attributable to the substrate enhanced efficiency of the screening effect of the C 1s core hole in the monolayer.…”

“…Because of their similar binding energy and the finite resolution of our experiment, their separation and energy determination by curve fitting would be quite speculative, and it will not be addressed in this context. In addition, a shake‐up satellite at around 286.3 eV (HOMO–LUMO shake up satellite) is expected to be visible for thick layers on top of the gold surface 18. To recognize its presence is not possible in our spectra.…”