We demonstrate a new organic solar cell fabrication and characterization technique that allows for a quick
screening of new materials and material combinations (i.e. blends) as active layers for solution processed
organic solar cells with respect to the optimization of the active layer thicknesses, thereby saving precious
material resources. Therefore we bar coat wedge-shaped layers by “horizontal dipping”. The photocurrent
under short circuit conditions, the external quantum efficiency and the absorption of those wedge-shaped
layers were then recorded spatially resolved. From the results the device photocurrent vs. the layer thickness
can be extracted allowing for conclusions about the optimum absorber layer thickness.