Figure 3
From: Photocarrier drift distance in organic solar cells and photodetectors
External Quantum Efficiencies (EQEs) (re-plotted from representations such asin Figure 2) shown as a function of the incident laserpower for the different active layer thicknesses of (a) PTB7:PC70BM and (b)PCDTBT:PC70BM blends.
The EQEs were normalized to 100% and the laser power to the 1 sun equivalentpower to visualize the bimolecular recombination losses at the short-circuitconditions. This methodology allows one to quantify the photocarrierbimolecular recombination losses in actual solar cells underclose-to-operational conditions. Figure (c) shows the recombination lossesestimated from the Figures (a) and (b) and plotted as a function of theactive layer thickness.
