Nano-cones for broadband light coupling to high index substrates.

ABSTRACT: The moth-eye structure has been proposed several times as an antireflective coating to replace the standard optical thin films. Here, we experimentally demonstrate the feasibility of a dielectric moth-eye structure as an antireflective coating for high-index substrates, like GaAs. The fabricated photonic crystal has Si₃N₄ cones in a square lattice, sitting on top of a TiO₂ index matching layer. This structure attains 1.4% of reflectance power losses in the operation spectral range of GaAs solar cells (440-870 nm), a 12.5% relative reduction of reflection power losses in comparison with a standard bilayer. The work presented here considers a fabrication process based on laser interference lithography and dry etching, which are compatible with solar cell devi

SUBMITTER: Buencuerpo J 

PROVIDER: S-EPMC5141501 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature