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Energy Express

Energy Express

  • Editor: Christian Seassal
  • Vol. 22, Iss. S5 — Aug. 25, 2014
  • pp: A1243–A1256

Design of antireflective nanostructures and optical coatings for next-generation multijunction photovoltaic devices

Emmett E. Perl, William E. McMahon, John E. Bowers, and Daniel J. Friedman  »View Author Affiliations


Optics Express, Vol. 22, Issue S5, pp. A1243-A1256 (2014)
http://dx.doi.org/10.1364/OE.22.0A1243


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Abstract

The successful development of multijunction photovoltaic devices with four or more subcells has placed additional importance on the design of high-quality broadband antireflection coatings. Antireflective nanostructures have shown promise for reducing reflection loss compared to the best thin-film interference coatings. However, material constraints make nanostructures difficult to integrate without introducing additional absorption or electrical losses. In this work, we compare the performance of various nanostructure configurations with that of an optimized multilayer antireflection coating. Transmission into a four-junction solar cell is computed for each antireflective design, and the corresponding cell efficiency is calculated. We find that the best performance is achieved with a hybrid configuration that combines nanostructures with a multilayer thin-film optical coating. This approach increases transmitted power into the top subcell by 1.3% over an optimal thin-film coating, corresponding to an increase of approximately 0.8% in the modeled cell efficiency.

© 2014 Optical Society of America

OCIS Codes
(040.5350) Detectors : Photovoltaic
(160.4760) Materials : Optical properties
(310.1210) Thin films : Antireflection coatings
(350.6050) Other areas of optics : Solar energy
(310.4165) Thin films : Multilayer design
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Light Trapping for Photovoltaics

History
Original Manuscript: April 21, 2014
Revised Manuscript: June 6, 2014
Manuscript Accepted: June 10, 2014
Published: July 15, 2014

Citation
Emmett E. Perl, William E. McMahon, John E. Bowers, and Daniel J. Friedman, "Design of antireflective nanostructures and optical coatings for next-generation multijunction photovoltaic devices," Opt. Express 22, A1243-A1256 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-S5-A1243


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