期刊
OPTICS EXPRESS
卷 21, 期 18, 页码 A847-A863出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.21.00A847
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- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, as part of the Center for Energy Efficient Materials Energy Frontier Research Center [DE-SC0001009]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, as part of the Center for Re-Defining Photovoltaic Efficiency through Molecule Scale Control Energy Frontier Research Center [DE-SC0001085]
The active layer materials used in organic photovoltaic (OPV) cells often self-assemble into highly ordered morphologies, resulting in significant optical anisotropies. However, the impact of these anisotropies on light trapping in nanophotonic OPV architectures has not been considered. In this paper, we show that optical anisotropies in a canonical OPV material, P3HT, strongly affect absorption enhancements in ultra-thin textured OPV cells. In particular we show that plasmonic and gap-mode solar cell architectures redistribute electromagnetic energy into the out-of-plane field component, independent of the active layer orientation. Using analytical and numerical calculations, we demonstrate how the absorption in these solar cell designs can be significantly increased by reorienting polymer domains such that strongly absorbing axes align with the direction of maximum field enhancement. (C) 2013 Optical Society of America
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