Stray Light-Absorbing Coatings for Solar Panels and AR/VR Hardware

Magdassi Shlomo, HUJI, Faculty of Science, The Institute of Chemistry
Mandler Daniel, HUJI, Faculty of Science, The Institute of Chemistry

Simple system eliminates the need for specialized application equipment



Solar energy, Thermo-solar, Nanoparticles, Carbon nanotubes, Stray light, Black coatings

Development Stage

Proof of concept

Patent Status

PCT published



  • A new, low-cost, black coating based on carbon nanotubes (CNTs), which form the most efficient light-absorbing materials available
  • High absorptance (>97%) coating suitable for a wide range of wavelengths (UV-IR)
  • High stability at elevated temperatures
  • Excellent adhesion to various surfaces
  • Excellent performance in preventing stray light in optical devices
  • Wet-deposition based spray

Our Innovation

A new black coating based on carbon nanotubes, the most efficient light-absorbing material available, is formulated in liquid paints and inks.


Key Features

  • Main advantages of the new formulation and coating:
  • Application by simple and rapid process, e.g., spraying or dipping.
  • Low-cost application process with no need for special high-cost equipment such as used in sputtering processes.
  • Very high absorptance, thermal stability and excellent adhesion
  • Extremely low reflectance (stray light prevention)
  • Suitable for small optical devices and large scale solar panel absorbers.



Development Milestones

  • Formulation has been completed and tested extensively
  • Large laboratory flat panels have been prepared
  • Successful coating of various complex shaped optical objects
  • Ready for large scale testing and field evaluation

The Market Opportunity

  • In 2013, a total capacity of 55.0 GWth, corresponding to 78.6million square meters of solar collectors, was installed worldwide, representing an increase in new collector installations of 1.8%compared to the year 2012.
  • The breakdown of the new installed capacity in 2013 by collector type is 17.4% glazed flat-plate collectors, 79.4% evacuated tube collectors, 3.1% unglazed water collectors and 0.1% glazed and unglazed air collectors.
  • The annual collector yield of all water-based solar thermal systems in operation by the end of 2013 was 314 TWh (= 1,129 PJ), corresponding to an energy savings equivalent of 33.7 million tons of oil and 109 million tons of CO2.

Researcher Information         




Contact for more information:

Matt Zarek