13 September 2012 Spatial mapping of photocurrents in organic solar cells comprising wedge-shaped absorber layers for an efficient material screening
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Abstract
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.
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Felix Nickel, Christian Sprau, Michael F. G. Klein, Jan Mescher, Uli Lemmer, Alexander Colsmann, "Spatial mapping of photocurrents in organic solar cells comprising wedge-shaped absorber layers for an efficient material screening", Proc. SPIE 8477, Organic Photovoltaics XIII, 84770E (13 September 2012); doi: 10.1117/12.930123; https://doi.org/10.1117/12.930123
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