Optical and xerographic properties of phthalocyanine codeposited composite film and ultrathin multilayered structure

The optical and xerographic properties of the phthalocyanine codeposited composite (cDC) films and ultrathin multilayered (UTML) structures have been studied. Observed UV-visible absorption spectra indicate that the Q-band absorption of the cDc films is different from that of the single component films, and from that of the UTML structures. The absorption peaks are shifted with the number and thickness of the layers. This spectral variation is most likely to be due to the dipole–dipole and charge transfer interactions among different molecular assemblies. The photosensitivity of the cDC films is superior to that of the single component films. This improvement is attributed to the efficient photoinduced charge transfer and charge separation among the composites. Moreover, the photosensitivity of the UTML structures is over tenfold better than that of the cDC films, probably due to the ultrafast photoinduced charge transfer and separation and the unipolar transport of the photogenerated holes.