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Abstract
By changing the concentration ratio (zinc-phthalocyanine-ZnPhTc:Fullerene-C60 from ZnPhTc:C60 = 1:0 through ZnPhTc:C60 = 1:1, to 1 C60: ZnPhTc = 1:0) in the active layer, as well as the architecture of the organic solar cells (OSC), a substanial increase of their short-circuit current is achieved. We suggest that the blurred interlayer boundaries lead to an enhanced motion of the holes and the electrons to the electrodes – ITO and Al respectively. Regardless of the shorter distances between the places of excitons creation, the excitons have enough "life-time" for diffusion to the suitable places where their decomposition to the charge carriers – holes and electrons, takes place. This is one of the well-known approaches to achieve a higher efficiency of the OSCs. We thus suggest that the possible interactions and processes discussed are obviously essential prerequisites for improving the functional parameters of the OSCs.
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Details
1 'Acad. J. Malinowski Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 109, 1113 Sofia, Bulgaria; To whom any correspondence should be addressed
2 'Acad. J. Malinowski Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 109, 1113 Sofia, Bulgaria
3 'Acad. J. Malinowski Institute of Optical Materials and Technologies, Bulgarian Academy of Sciences, Acad. G. Bonchev Str., Bl. 109, 1113 Sofia, Bulgaria; Faculty of Chemistry, Center for Materials Research, Brno University of Technology, 118 Purkynova, 612 00 Brno, The Czech Republic