Tuning the interfacial layers in OPVs should enable reduced resistance and control of the work function of the electrode. We synthesized an amine-functionalized polyfluorene derivative (PF-PDMA) as an interfacial layer for organic photovoltaic cells. We fabricated a conventional device using PF-PDMA as an electron transport layer. P3HT and PC61BM were employed as the active layer to form the bulk heterojunction. The power conversion efficiency of the device fabricated using the interlayer (3.18 %) was higher than that of the device without the interfacial layer (2.36 %).