Optimizing the thickness of organic solar cells (OSCs) is a potent way to enhance the power conversion efficiency (PCE). In the present work, we have investigated a novel structure in which poly (9, 9‐dioctylindenofluorene‐co‐benzothiadiazole) (PIF8BT): N′‐bis (1‐ethylpropyl) ‐3, 4, 9, 10‐perylene tetracarboxy diimide (PDI) is used as a photoactive absorber layer. The influence of window layer material such as Zinc oxide (ZnO) and titanium dioxide (TiO2) with various electrode materials including Indium tin oxide (ITO), Fluorine tin oxide (FTO), aluminum(Al) Silver (Ag) and Gold (Au) with different combinations have been investigated with the objective to enhance the absorption and PCE of the cell. Extracted results shows that the proposed scheme of the structure with ITO/Al as top and bottom electrode holds the highest performance parameters including Jsc=9.26 (mA/m2), Voc=0.59 (V), FF=68.86% and ƞ=3.86% respectively as compared to different electrode combination and window layers with the same photoactive absorber material(PIF8BT:PDI). This indicates that the proposed structure can be a good choice for replacing less efficient in-organic cell.