Efficient light-trapping nanostructures in thin silicon solar cells
Author(s)Han, Sang Eon; Mavrokefalos, Anastassios; Branham, Matthew Sanders; Chen, Gang
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We examine light-trapping in thin crystalline silicon periodic nanostructures for solar cell applications. Using group theory, we show that light-trapping can be improved over a broad band when structural mirror symmetry is broken. This finding allows us to obtain surface nanostructures with an absorptance exceeding the Lambertian limit over a broad band at normal incidence. Further, we demonstrate that the absorptance of nanorod arrays with symmetry breaking not only exceeds the Lambertian limit over a range of spectrum but also closely follows the limit over the entire spectrum of interest for isotropic incident radiation. These effects correspond to a reduction in silicon mass by two orders of magnitude, pointing to the promising future of thin crystalline silicon solar cells.
DepartmentMassachusetts Institute of Technology. Department of Mechanical Engineering
Proceedings of SPIE--the International Society for Optical Engineering
Society of Photo-optical Instrumentation Engineers
Han, Sang Eon et al. “Efficient Light-trapping Nanostructures in Thin Silicon Solar Cells.” Proc. SPIE 8031, Micro- and Nanotechnology Sensors, Systems, and Applications III, (May 13, 2011) Ed. Thomas George, M. Saif Islam, & Achyut K. Dutta. 2011. 80310T–80310T–9. CrossRef. Web.© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).
Final published version
Proc. of SPIE Vol. 8031