anti-reflective coating

Scientists in the United Kingdom have investigated the durability and performance of all antireflecting coatings for solar modules and said further work is needed to improve industry standards. Their review addresses single-layer and multi-layer techniques and provides insight on their costs and viability.

A first-of-its-kind survey has revealed the extent to which automation and robot module cleaning is being adopted by large-scale PV project owners and operators. And the trend is clear; as solar expands geographically and projects grow, the use of robotics in solar operations and maintenance (O&M) is increasing, and the level of understanding as to their benefits is on the rise. Ecoppia, a pioneer in the robotic cleaning segment, partnered with pv magazine on the survey and the results speak volumes.

French chemical company Axcentive and solar module manufacturer Photowatt have developed a PV panel coating based on photoactive nanotechnology. The coating relies on a super-hydrophilic surface that makes the water spread out on the module surface immediately, thus avoiding light scattering effects upon rain.

Consisting of a two-dimensional (2D) array of rings and pillars, the structure can improve the short-circuit current of a thin-film crystalline solar cell by over 50%, its creators say. The subwavelength AR structures are robust to certain degrees of fabrication errors, they add.

Founded in 2018, Edgehog Advanced Technologies has developed an omnidirectional anti-reflective glass for solar panels, which increases their production, especially at the start and end of the day.

Dutch materials company DSM has sold its resins and functional materials businesses, which encompass its anti-reflective and anti-soiling solar glass coating products. That will mean a focus on module backsheets in DSM’s Advanced Solar business unit.

Scientists in Spain have tested various properties of anti-reflective and anti-soiling coatings for PV module glass, aiming to develop a material that offers the best balance of desired material properties at the lowest cost. Over a year of testing, the best coatings were shown to boost module output by around 2%, and the group also made several observations that could influence future developments of coatings for PV module front glass.

Researchers in China have sought to understand how soiling exacerbated by anti-reflective coatings might inhibit solar panel output. In terms of effectiveness against soiling, the scientists found hollow-silica-nanoparticle coatings did better than solid silica alternatives.

The developer of the material, US-based specialist Pellucere, says its innovation can raise PV energy yield 3.5-4.2%.