Dual gratings for enhanced light trapping in thin-film solar cells by a layer-transfer technique
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Thin film solar cells benefit significantly from the enhanced light trapping offered by photonic nanostructures. The thin film is typically patterned on one side only due to technological constraints. The ability to independently pattern both sides of the thin film increases the degrees of freedom available to the designer, as different functions can be combined, such as the reduction of surface reflection and the excitation of quasiguided modes for enhanced light absorption. Here, we demonstrate a technique based on simple layer transfer that allows us to independently pattern both sides of the thin film leading to enhanced light trapping. We used a 400 nm thin film of amorphous hydrogenated silicon and two simple 2D gratings for this proof-of-principle demonstration. Since the technique imposes no restrictions on the design parameters, any type of structure can be made. (C) 2013 Optical Society of America
Schuster , C S , Kowalczewski , P , Rezende Martins , E , Patrini , M , Scullion , M G , Liscidini , M , Lewis , L , Reardon , C , Andreani , L C & Krauss , T F 2013 , ' Dual gratings for enhanced light trapping in thin-film solar cells by a layer-transfer technique ' Optics Express , vol 21 , no. Suppl 3 , pp. A433-A439 . DOI: 10.1364/OE.21.00A433
(c) 2013 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at http://www.opticsinfobase.org
This work was supported by the EU through Marie Curie Action FP7-PEOPLE-2010-ITN Project No. 264687 “PROPHET”.
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