Silicon dioxide (SiO2) nanoparticles, obtained by sol-gel technique, were used to create an antireflective coating (ARC) for the use in a high concentrating photovoltaic (HCPV) device. These ARCs have shown a transmission increase from 92% up to 99% when deposited on glass substrate. The introduction of these same ARCs, with different optical paths, in the HCPV system has shown an overall power increase with strong dependence of the HCPV module performance (based on triple junction solar cells) upon the different ARC transmission spectra. ptimal ARC spectral shape was thus determined. A net additional power generation of 4.3% of the HCPV was measured, indicating almost complete elimination of Fresnel reflection losses in the system. Crown Copyright (C) 2016 Published by Elsevier Ltd. All rights reserved.