Full text loading...
He I UP-spectra. The center graph shows the complete spectra as measured. The bottom spectrum corresponds to the pristine, in-vacuum cleaved, HOPG surface. The subsequent spectra were measured after each of the P3HT deposition steps. On the right, the valence bands/HOMO spectral region is shown with removed background. On the left, the secondary edge feature is shown normalized allowing better comparison. The insert shows the evaluation of the HOMO cutoff of the deposition step for the determination of ionization energy and orbital alignment at the HOPG interface.
Series of S doublet spectra measured with XPS. The bottom spectrum was measured on the freshly cleaved HOPG crystal. The upper spectra were measured after each of the P3HT deposition steps. The peaks show a slight shift to higher binding energy, which indicates the formation of band bending at the interface.
Schematic depiction of the electronic structure of the HOPG/P3HT interface as determined from the spectra shown in Figs. 1 and 2.
Article metrics loading...