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The performance of bi-layer organic solar cells with the structure ITO/PEDOT:PSS/CuPc/C 60 /BCP/Al was optimized. Prior to cell deposition, an optimal indium tin oxide (ITO) surface treatment technique was determined, with N 2 plasma treatment providing the highest solar cell efficiency. Parametric studies were performed to identify optimal fabrication conditions and deposition thicknesses for each layer by using solar cell efficiency as the primary performance measure.