The article by Shaheen et al. (2001) published in *Applied Physics Letters* reports a significant improvement in the power conversion efficiency of organic photovoltaic devices based on a conjugated polymer/methanofullerene blend. By structuring the blend to reduce phase segregation of methanofullerenes and increasing the interactions between conjugated polymer chains, the team fabricated a device with a power conversion efficiency of 2.5% under AM1.5 illumination. This represents a nearly threefold enhancement over previously reported values and brings the technology closer to practical use for harvesting solar energy. The study highlights the importance of casting conditions, particularly the choice of solvent, in determining the mechanical and electrical properties of the photoactive layer. Using chlorobenzene as the casting solvent led to a more uniform blend, smoother surface, and increased charge carrier mobility, resulting in higher short-circuit current density and fill factor. These findings suggest that organic photovoltaic devices have the potential to become a viable technology for future power generation.The article by Shaheen et al. (2001) published in *Applied Physics Letters* reports a significant improvement in the power conversion efficiency of organic photovoltaic devices based on a conjugated polymer/methanofullerene blend. By structuring the blend to reduce phase segregation of methanofullerenes and increasing the interactions between conjugated polymer chains, the team fabricated a device with a power conversion efficiency of 2.5% under AM1.5 illumination. This represents a nearly threefold enhancement over previously reported values and brings the technology closer to practical use for harvesting solar energy. The study highlights the importance of casting conditions, particularly the choice of solvent, in determining the mechanical and electrical properties of the photoactive layer. Using chlorobenzene as the casting solvent led to a more uniform blend, smoother surface, and increased charge carrier mobility, resulting in higher short-circuit current density and fill factor. These findings suggest that organic photovoltaic devices have the potential to become a viable technology for future power generation.