SPLTRAK Abstract Submission
Testing the Abrasion Resistance of Porous SiO2 Anti-reflection Coatings for Solar Cover Glass
Adam M Law, Farwah Bukhari, Luke O Jones, Ali Abbas, John M Walls
CREST, Wolfson School, Loughborough University, Loughborough, United Kingdom

The cover glass sheet on solar modules can cause reflection losses as well as soiling build-up. Reflection losses can be addressed with anti-reflection (AR) coatings, whilst soiling is removed by mechanical cleaning processes that are effective but can have adverse effects on surface coatings. In this work, commercial porous SiO2 AR coatings have been subject to abrasion testing that simulates the regular cleaning of solarmodules in the field. After 50 and 100 abrasion cycles, significant scratches are visible on the coating, and the weighted average reflectance (WAR) of the coating increases from 5.97% to 6.99%and 7.08%, respectively. The coating is fully removed in some abraded areas. Significant abrasion damage to porous SiO2  AR coatings is a major problem for solar asset managers resulting in long-term power losses