The primary focus of this thesis was the electrical characterization of organic solar cells with ITO (Indium Tin Oxide) as the anode. The electrical characterization was done on the solar simulator as well as impedance spectroscopy on Modulab-Solartron. The parameters compared in 2D and 3D cells were direct resistance, impedance, capacitance & shunt resistance in order to fully understand the different variables of the solar cells how they affect the efficiency of the cell. Initially the manufacturing process was done on 2D (plain PET) to develop a process that would be most efficient for 3D PET (PET with pillars), and the comparison of impedance and capacitance data of each cell manufactured would be consistent. ITO was used as the anodic layer followed by a layer of Orgacon, the photoactive layer was the combination of P3HT:PCBM which is one of the most widely used photoactive. The research was also to see how 3D PET is more beneficial than 2D in terms of Efficiency and Resistance. The research led to optical characterization through Scanning Electron Microscope (SEM) images which led to understanding the role of thickness of the various layers in contribution to the resistance of the overall cell.