Fundamental limit of light trapping in grating structures

Zongfu Yu, Aaswath Raman, Shanhui Fan

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


We use a rigorous electromagnetic approach to analyze the fundamental limit of light-trapping enhancement in grating structures. This limit can exceed the bulk limit of 4n 2, but has significant angular dependency. We explicitly show that 2D gratings provide more enhancement than 1D gratings. We also show the effects of the grating profile’s symmetry on the absorption enhancement limit. Numerical simulations are applied to support the theory. Our findings provide general guidance for the design of grating structures for light-trapping solar cells.
Original languageEnglish (US)
Pages (from-to)A366
JournalOptics Express
Issue numberS3
StatePublished - Aug 11 2010
Externally publishedYes


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