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Jonathan D. Servaites, Sina Yeganeh, Tobin J. Marks and Mark A. Ratner Efficiency Enhancement in Organic Photovoltaic Cells: Consequences of Optimizing Series Resistance Advanced Functional Materials 20

Article first published online: 8 OCT 2009 | DOI: 10.1002/adfm.200901107

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Efficiency enhancement in organic photovoltaic (OPV) solar cells is studied via optimizing the series resistance (Rs). It is shown that current bulk-heterojunction (BHJ) OPVs are approaching the limit for which efficiency can be improved via Rs reduction alone. The evaluation addresses OPVs based on a poly(3-hexylthiophene):6,6-phenyl C61-butyric acid methyl ester active layer. A projected high-efficiency (>10%) scenario is also considered and shown to have greater, but modest, Rs losses. Finally, for moderate to large cell sizes (> ≈ 0.1 cm2), it is shown that the anode resistance dominates Rs losses.

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