Two-layer anti-reflection coatings with optimized sub-bandgap reflection for solar modules

Ian M. Slauch, Michael G. Deceglie, Timothy J. Silverman, Vivian E. Ferry

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

The efficiency of a crystalline silicon solar module decreases as its operating temperature rises. Module cooling is possible via selective reflection of sub-bandgap photons so that they are not parasitically absorbed. Selecting from a library of common dielectrics, we numerically optimize the design of two-layer mirrors at the outer glass surface of a crystalline Si solar cell module. The mirrors are designed to maximize the annual energy yield of a module by both reflecting light below the bandgap and enhancing the transmission of light above the bandgap. Combined ray-tracing and finite element simulations determine the power output and temperature of the module over time. Since any two-layer mirror would replace a conventional single-layer glass anti-reflection coating on the module glass, we study the ability of a two-layer structure to improve on a single-layer coating. The best two-layer designs improve the annual energy yield over a module with a glass anti-reflection coating and reduce the module operating temperature.

Original languageEnglish (US)
Title of host publicationNew Concepts in Solar and Thermal Radiation Conversion and Reliability
EditorsJeremy N. Munday, Michael D. Kempe, Peter Bermel
PublisherSPIE
ISBN (Electronic)9781510620896
DOIs
StatePublished - Jan 1 2018
EventNew Concepts in Solar and Thermal Radiation Conversion and Reliability 2018 - San Diego, United States
Duration: Aug 19 2018Aug 21 2018

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10759
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceNew Concepts in Solar and Thermal Radiation Conversion and Reliability 2018
CountryUnited States
CitySan Diego
Period8/19/188/21/18

Keywords

  • Anti-reflection
  • Cooling
  • Photonic structures
  • Selective reflection
  • Solar cells
  • Solar modules
  • Solar thermal management

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