Phthalocyanine-C60 composites as improved photoreceptor materials?

2 -Pc, in contact with C₆₀ is studied using photoelectron spectroscopy with ultraviolet and X-ray radiation (UPS and XPS, respectively), X-ray absorption near edge spectroscopy (XANES), and optical transmission spectroscopy. A possible improvement of the charge-carrier generation efficiency, which is essential for the performance as photoreceptor material, is thereby found for these materials upon doping with C₆₀. No ground-state charge transfer is detected for the Pcs in contact with C₆₀. The effect of an enhanced photoconductivity is demonstrated for τ-H₂-Pc when it is doped by 5% C₆₀. Received: 16 March 1998/Accepted: 16 March 1998