Journal
OPTICS EXPRESS
Volume 21, Issue 25, Pages 30315-30326Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.030315
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Funding
- Department of Energy Basic Energy Sciences
- Light Material Interactions Energy Frontier Research Center [DE-SC0001293]
- National Science Foundation [DE-EE0004946]
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We report here several different superlattice photonic crystal based designs for 200nm thick c-Si solar cells, demonstrating that these structures have the ability to increase broadband absorption from lambda = 300nm to 1100nm by more than 100% compared to a planar cell with an optimized anti-reflection coating. We show that adding superlattices into photonic crystals introduces new optical modes that contribute to enhanced absorption. The greatest improvements are obtained when combining a superlattice photonic crystal with a randomly textured dielectric coating that improves incoupling into the modes of the absorbing region. Finally, we show that our design methodology is also applicable to layers 1 to 4 microns in thickness, where absorbed currents competitive with conventional thick Si solar cells may be achieved. c 2013 Optical Society of America
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