Harnessing multiple generated excitons from intermolecular singlet fission of perylene–monoimides in a p-type dye-sensitized solar cell

•Perylene-monoimide monomers on p-type semiconductor exhibit singlet fission.•Intermolecular singlet fission in the solid state.•P-type dye-sensitized solar cells capable of harnessing the power of singlet fission.•Transparent p-type NiO semiconductor for transient absorption measurements.