Figure 2
From: A New Figure of Merit for Organic Solar Cells with Transport-limited Photocurrents
Fill factor (FF) as a function of the dimensionless parameter α.
Open circles are FF-α points from simulated JV-curves with balanced mobilities and Voc between 0.7 and 0.9 V (see ref. 9 for the simulation parameters). Dashed and solid lines show analytical FF-α dependencies according to Eqs 16 and 18, with the normalized open circuit voltage uoc expressed as a function of α following Eq. 19 (T = 300 K, Voc = 0.8 V). Photocurrents will become strongly transport-limited for α larger than 1, resulting in a progressive decrease of the fill factor when α increases beyond one.
