Two-Layer Anti-Reflection Coatings with Optimized Sub-Bandgap Reflection for Solar Modules: Paper No. 1075911

Michael Deceglie, Timothy Silverman, Ian Slauch, Vivian Ferry

Research output: Contribution to conferencePaper

6 Scopus Citations


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 languageAmerican English
Number of pages8
StatePublished - 2018
EventSPIE Optical Engineering + Applications - San Diego, California
Duration: 19 Aug 201823 Aug 2018


ConferenceSPIE Optical Engineering + Applications
CitySan Diego, California

NREL Publication Number

  • NREL/CP-5K00-72082


  • anti-reflection
  • cooling
  • photonic structures
  • selective reflection
  • solar cells
  • solar modules
  • solar thermal management


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