Fig. 4

Quantification of the energy losses. a, b Fourier-transform photocurrent spectroscopy of ZR1:Y6, ZR1:IDIC-4Cl blend and corresponding single component solar cell. c The electroluminescence quantum efficiency of ZR1:Y6 and ZR1:IDIC-4Cl blend solar cells at different injected currents. d Schematic diagram for energy loss of ZR1:Y6 and ZR1:IDIC-4Cl blend solar cells.