Scatter Plot from Scientific Research

Capacitance C-Cgeo estimated from admittance spectroscopy measurements a) under illumination at open circuit and b) in the dark on organic solar cells with an active layer consisting of PffBT4T-2OD:EH-IDTBR or PBDB-TF-T1:BTP-4F-12. The dashed lines represent exponential fits to the experimental data with a slope of 1/(2EU,CV). The Urbach energy EU,CV extracted from the fits for PBDB-TF-T1:BTP-4F-12 is about twice as high as for the optical measurements whereas the values for PffBT4T-2OD:EH-IDTBR are unrealistically high.

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