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(a) current density versus voltage measurements obtained for an inverted solar cell using a P3HT/P(TzDPP-Th) blend (mass ratio 1/0.5) as the active layer in the dark (closed symbols) and under standard AM 1.5 G 100 mW/cm2 illumination conditions (open symbols). The corresponding external quantum efficiency (closed symbols) and internal quantum efficiency (open symbols) spectra are displayed in (b).
