Figure 1
From: Photocarrier drift distance in organic solar cells and photodetectors

Average current density-voltage (JV) characteristics under standard AM1.5G illumination of organic solar cells fabricated from (a) PTB7:PC70BM blendswith 100 nm, 230 nm and 700 nm thick activelayers and (b) PCDTBT:PC70BM blends with 75 nm, 230 nm and850 nm thick junctions.
The photovoltaic performance of the PCDTBT:PC70BM blends is much moresusceptible to the film thickness of the active layer compared toPTB7:PC70BM.