Periodic dielectric structures for light-trapping in ingaas/gaas quantum well solar cells

Sam Turner, Sudha Mokkapati, Greg Jolley, Lan Fu, Hark Hoe Tan, Chennupati Jagadish

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7 Citations (Scopus)


We study dielectric diffraction gratings for light-trapping in quantum well solar cells and compare their performance with plasmonic and Lambertian light-trapping structures. The optimum structural parameters are identified for symmetric uni-periodic, symmetric bi-periodic and asymmetric bi-periodic gratings. The enhancement in short-circuit current density from the quantum well region with respect to a reference cell with no diffraction grating is calculated. The ratio of this enhancement to the maximum achievable enhancement (i.e. no transmission losses) is 33%, 75% and 74%, respectively for these structures. The optimum asymmetric and symmetric bi-periodic structures perform closest to Lambertian light-trapping, while all three optimum grating structures outperform optimum plasmonic light-trapping. We show that the short-circuit current density from the quantum well region is further enhanced by incorporating a rear reflector.

Original languageEnglish
Pages (from-to)A324-A335
Number of pages12
JournalOptics Express
Issue number103
Publication statusPublished - 6 May 2013
Externally publishedYes

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