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
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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