Fig. 3
From: Enabling low voltage losses and high photocurrent in fullerene-free organic photovoltaics
Optical and electrical characterizations. a Fourier-transform photocurrent spectroscopy of PBDB-T:Y1 and :Y2 blend solar cell. b The electroluminescence quantum efficiency of PBDB-T:Y1 and PBDB-T:Y2 blend solar cells at different injected currents. c, d Time-resolved for D:A blends and polystyrene blends. Black solid curves are fitting curves for extracting the lifetime (\(\tau _{{\mathrm{av}}} = \frac{{{\mathrm{\Sigma }}A_i\tau _i^2}}{{{\mathrm{\Sigma A}}_{\mathrm{i}}\tau _i}}\)).
