A photovoltaic effect was detected for the PPC samples with the dye concentrations ≥ 1-3 wt.%. When the concentration of the dye was changed from 10 to 15 wt.% the maximum value of VPH (VPH max), determined during exposure of the samples to light, differed little. However, the kinetics of variation of VPH during irradiation (t) and after switching off the light and also the VPHmax value change significantly in the series of CPDs 1-3 (Fig. , Table ). The VPHmax value decreases, while the rate of variation of VPH after switching on and switching off of the light increases. In the VPH(t) kinetic relationships two components are observed after switching on the light: initially VPH increases quite rapidly, but the rate of the process then decreases. When the light is switched off the VPH value decreases quite rapidly, but it then relaxes slowly. The relaxation of VPH takes tens of minutes or even a few hours (Fig. ). To determine the reasons for the appearance of the photovoltaic effect and its characteristics in the investigated PPCs we use the previously developed model concepts of photogeneration, transport, and recombination of charge carriers in disordered organic materials. In the general case the photoconductivity of the PPC films is secured by the presence of three types of molecules in them: donors, acceptors, and centers of photogeneration of charge carriers. The absorption of a quantum of light occurs at the photogeneration center, and this converts it from the ground state to the excited state. These centers may be intermolecular charge-transfer complexes (CTCs) formed between molecules with electron-donating and electron-withdrawing characteristics, or dye molecules, or their aggregates.