High performance broad band antireflective coatings using a facile synthesis of ink-bottle mesoporous MgF2 nanoparticles for solar applications

- High Performance broad band anti-reflective coating (BARC) was developed by a facile synthesis of Ink-Bottle mesoporous MgF2 nanoparticles.
- The nanoparticles were prepared by a unique route of deformation- reformation.
- BARC showed high performance (100% T) in short range in visible region with an average transmittance >99% in entire visible region.
- A net increase in efficiency of 6% achieved when c-Si solar cell is covered with AR coated plate.
- BARC showed high environmental and thermal stability.

Ultra-low refractive index thin films suitable for practical antireflective (AR) applications must be highly transparent, economical, and durable against temperature and weather conditions. In this work, we present a high performance broad band antireflective coating using a facile synthesis of Ink-Bottle mesoporous MgF2 nanoparticles. The nanoparticles having high crystalline and dispersible properties were prepared by a deformation-reformation route from coarse commercial MgF2 hydrate powder by Lyothermal synthesis. These nanoparticles, after dispersion in a suitable solvent were used to develop a single layer AR coating by dip-coating technique. We precisely developed coatings tunable to achieve minimum reflection losses between 400 and 1500 nm. The AR coating exhibited nearly 100% transmittance within visible range (615-660 nm) and an average transmittance of 99% and 97% in the visible (400-800 nm) and active solar range (300-1500 nm) respectively. Further, use of the AR coating on PV glass led to a net improvement of 6% in efficiency for c-Si solar cells. This work opens a promising approach to improve the device performance of solar cells as well as solar collectors by developing broad band antireflective surfaces using mesoporous nanoparticles.