Currently, fullerene C 60 , C 70 , C 84 and their derivatives have been widely explored as the acceptor to pair with conjugated polymer donors in organic solar cells (OSCs). To offer a practical guide for researchers in the field of OSCs, we applied Scharber's model to assess the photovoltaic performance of the fullerenes. The power conversion efficiency (PCE) of an OSC device under sunlight irradiation is determined by open-circuit voltage (V OC ), short-circuit current density (J SC ), fill factor (FF), and the power of incident light P in with: