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Periodic dielectric structures for light-trapping in InGaAs/GaAs quantum well solar cells

Turner, Sam, Mokkapati, Sudha, Jolley, Greg, Fu, Lan, Tan, Hark Hoe and Jagadish, Chennupati 2013. Periodic dielectric structures for light-trapping in InGaAs/GaAs quantum well solar cells. Optics Express 21 (S3) , A324-A335. 10.1364/OE.21.00A324

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Abstract

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.

Item Type: Article
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: Optical Society of America
ISSN: 1094-4087
Last Modified: 09 Aug 2017 09:40
URI: http://orca-mwe.cf.ac.uk/id/eprint/103457

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