We have performed a program simulation for design and development of highly efficient organic solar cells. We have simulated a model cell structure of ITO (indium-tin-oxide) anode/CuPc (copper phthalocyanine)/$C_{60}$ (fullerene)/BCP (2,9-dimethyl-4.7-diphenyl-1,10-phenanthroline)/Al (aluminum) cathode. As a result, obtained short-circuit current density ($J_{sc}$), open-circuit voltage ($V_{oc}$), values of fill factor (FF), and power conversion efficiency (${eta}$) are 2.25 $mA/cm^2$, 0.442 V, and 0.35, 0.35 %,. Also, Organic solar cells were manufactured with a condition obtained from simulation. Experimentally obtained values of $J_{sc}$, $V_{oc}$, and ${eta}$ are 1.05 $mA/cm^2$, 0.25 V, and 0.21 %, respectively. When compared experimental results with optimum simulation structure, the values of $J_{sc}$, $V_{oc}$, and ${eta}$ are reduced by 53, 40, and 65 %, respectively.