Organic photocondutors and C_60

摘要

We report experimental results on photoelectron spectroscopy (XPS, UPS) and X-ray absorption near edge spectroscopy (XANES) from poly(3-octylthiophene) (P3OT) and Cu-phthalocyanine (Cu-Pc) in contact with C_60. The interaction between these organic photoconductors and the C_60 is rather weak. At rom temperature an inter-diffusion between C_60 and P3OT is observed, whereas Cu_Pc and C_60 build a stable interface. The spectra reveal the relative positions of the electronic levels close to the optical gap. From this we conclude that an electron transfer to C_60 via some excitonic states of the photoconductor is energetically possible. Cu-Pc exhibits a band-bending induced by C_60 as deduced from the observed shifts in the XPS and UPS spectra and the missing shifts in the XANES spectra.