Design of Antireflective Nanostructures and Optical Coatings for Next-Generation Multijunction Photovoltaic Devices

William McMahon, Daniel Friedman, Emmett Perl, John Bowers

Research output: Contribution to journalArticlepeer-review

30 Scopus Citations

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 thinfilm 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.

Original languageAmerican English
Pages (from-to)A1243-A1256
JournalOptics Express
Volume22
Issue numberS5
DOIs
StatePublished - 2014

NREL Publication Number

  • NREL/JA-5J00-62931

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