Scratch-resistant zeolite anti-reflective coating on glass for solar applications

Chien Hung Chen, Shiao Yi Li, Anthony S.T. Chiang, Albert T. Wu, Y. S. Sun

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Sol-gel SiO2 anti-reflection (AR) coating on solar glass is known to increase the current output by a few percent, but its mechanical durability is of concern. To improve its strength, the amorphous SiO2 may be replaced by zeolite, which is a microporous aluminosilicate crystalline material. Scratch-resistant AR coating has been prepared by the dip coating of a composition which contains aggregated zeolite nanoparticles as the structure provider and zeolite precursors as the reactive binder. AR coating with better than 5H pencil hardness can be made with a composition containing BEA zeolite. Nanoindenter measurements show that this BEA zeolite films have 1.5 GPa indent hardness and 35 GPa elastic modulus. Furthermore, the freshly prepared AR coating shows a self-cleaning effect with a water contact angle (WCA) close to zero. It can be made super-hydrophobic with larger than 130° WCA after modifying with hexamethyl-disilazane (HMDS), upon which the pencil hardness further increases to 6H.

Original languageEnglish
Pages (from-to)1694-1700
Number of pages7
JournalSolar Energy Materials and Solar Cells
Volume95
Issue number7
DOIs
StatePublished - Jul 2011

Keywords

  • AR coating
  • Elastic modulus
  • Nanoindent
  • Pencil hardness
  • Refractive index
  • Zeolite

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