Passive radiative cooling of silicon solar modules with photonic silica microcylinders

Evelijn Akerboom*, Tom Veeken, C. Hecker, Jorik Van De Groep, Albert Polman

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)
30 Downloads (Pure)


Passive radiative cooling is a method to dissipate excess heat from a material by the spontaneous emission of infrared thermal radiation. For a solar cell, the challenge is to enhance PRC while retaining transparency for sunlight above the bandgap. Here, we design a hexagonal array of cylinders etched into the top surface of silica solar module glass to enhance passive radiative cooling. Multipolar Mie-like resonances in the cylinders are shown to cause antireflection effects in the infrared, which results in enhanced infrared emissivity. Using Fourier transform infrared spectrometry we measure the hemispherical reflectance of the fabricated structures and find the emissivity of the silica cylinder array in good correspondence with the simulated results. The microcylinder array increases the average emissivity between λ = 7.5-16 μm from 84.3% to 97.7%, without reducing visible light transmission.

Original languageEnglish
Pages (from-to)3831-3840
Number of pages10
JournalACS photonics
Issue number12
Publication statusPublished - 21 Dec 2022


  • antireflection coating
  • FTIR spectroscopy
  • Kerker condition
  • Mie resonances
  • photonics
  • radiative cooling


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