Multichromophoric energy sensitization of C₆₀ for organic photovoltaics Available to Purchase

In organic photovoltaics (OPVs), photocurrent generation is limited by absorption and exciton diffusion in the active layer. In this work, we describe the energy sensitization of C₆₀ simultaneously by two chromophores at high volume concentrations (50%). This sensitization strategy takes advantage of the intense absorption of the sensitizers and the exceptional electron conduction and exciton diffusion length of C₆₀ resulting in a 30% increase in photoresponse of the C₆₀-based sensitized acceptor layer between λ = 450 nm and 670 nm and power conversion efficiency under simulated AM 1.5 G illumination. In (2,4-bis[4-(N,N-diphenylamino)-2,6-dihydroxyphenyl] squaraine)/C₆₀ devices, sensitization results in an increase in J_SC from 6.5 ± 0.2 mA/cm² to 8.6 ± 0.2 mA/cm² without compromising V_OC or FF. These results demonstrate the robust nature of this sensitization scheme and its broad potential for application in OPVs.