Organic small molecule and polymer materials are being considered as solar cell material in place of silicon wafer. Organic solar cells are now a popular subject in international research. This study uses ZnPc and C 60 as respectively the donor material and acceptor material of Organic Solar Cells (OSC) and examines the effects of different blocking layers and structures (P-N junction and P-IN structure) on open-circuit voltage (V OC), short-circuit current (I SC), fill factor (FF) and efficiency of solar cell. It is found under the same thickness of 15nm, the short-circuit current generated by the BCP and BAlq 3 blocking layers is respectively 1.36 and 1.19 mA/cm 2. This is because the BCP has higher energy gap and Highest Occupied Molecular Orbital (HOMO) than BAlq 3 , which enables BCP to block excitons and holes better. When the P-IN structure is ZnPc(30 nm)/C 60 (40 nm) and ZnPc(30 nm)/ZnPc:C 60 (20 nm)/C 60 (40 nm), the short-circuit current produced could be increased to 2.67 mA/cm 2 respectively. This is because the intrinsic layer increases the contact area of P-N junction, enabling more excitons to dissociate into free charges.

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