Enhancing extraction of photogenerated excitons from semiconducting carbon nanotube films as photocurrent

► Employed carbon nanotubes as efficient photoabsorbers in photovoltaic devices. ► Achieved peak 23% photon to collected charge efficiency at nanotube bandgap. ► Demonstrated that removing polymer ligands enhances photocurrent generation. ► Increased optical density and range of exciton migration via polymer removal.