© 2016, National Institute of Optoelectronics. All rights reserved.In this research, optical absorption processes have been studied for a specific type of nanostructured organic solar cells with a donor-acceptor polymer-fullerene active layer using the Fresnel absorption and transfer coefficients by optical transfer matrix model. Two different structures,SiO2 − ITO − PEDOT: PSS − CuPC − C60 – Al andSiO2 − ITO − CuPC − C60 − Al have been proposed for this simulation. Initially, we explored the wavelength-dependent optical absorption in the case of the proposed devices, and the analyses, showed a maximum optical absorption in a wavelength of about 600nm. Then, we determined the normalized modulus square electric field (E2) and energy dissipation factor (Q) for different thicknesses of active layer in a given wavelength (600nm). Also, we obtained the optimum thicknesses in the case of all layers in 600nm incident wavelength. In the next step, we determined power conversion efficiency for two proposed structures. The results showed that, the presence of a thin layer of PEDOT: PSS reveals an increase in the efficiency of the device. By providing the possibility of controlling the thickness-dependent optical properties, these types of simulations could help technologists to design and propose solar cell devices with high efficiencies.