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Opt Lett. 2011 Oct 15;36(20):3990-2. doi: 10.1364/OL.36.003990.

Slow-light-enhanced upconversion for photovoltaic applications in one-dimensional photonic crystals.

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  • 1University of New South Wales, School of Photovoltaic and Renewable Energy Engineering, Sydney, New South Wales, Australia.


We present an approach to realizing enhanced upconversion efficiency in erbium (Er)-doped photonic crystals. Slow-light-mode pumping of the first Er excited state transition can result in enhanced emission from higher-energy levels that may lead to finite subbandgap external quantum efficiency in crystalline silicon solar cells. Using a straightforward electromagnetic model, we calculate potential field enhancements of more than 18× within he slow-light mode of a one-dimensional photonic crystal and discuss design trade-offs and considerations for photovoltaics.

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