Figure 3
From: A New Figure of Merit for Organic Solar Cells with Transport-limited Photocurrents
Maximum active layer thickness to avoid transport limitations.
Shown is the maximum active layer thickness dmax calculated with Eq. 24 in dependence of the effective charge carrier mobility 
and the nongeminate recombination coefficient k2 for a short circuit current of 15 mA/cm2. Above dmax, photocurrents become severely transport-limited.
