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Nano Lett. 2012 Mar 14;12(3):1616-9. doi: 10.1021/nl204550q. Epub 2012 Feb 29.

Absorption enhancement in ultrathin crystalline silicon solar cells with antireflection and light-trapping nanocone gratings.

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Department of Applied Physics, Stanford University, Stanford, California 94305, USA.


Enhancing the light absorption in ultrathin-film silicon solar cells is important for improving efficiency and reducing cost. We introduce a double-sided grating design, where the front and back surfaces of the cell are separately optimized for antireflection and light trapping, respectively. The optimized structure yields a photocurrent of 34.6 mA/cm(2) at an equivalent thickness of 2 μm, close to the Yablonovitch limit. This approach is applicable to various thicknesses and is robust against metallic loss in the back reflector.

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