Moth-eye antireflective surfaces: specular reflection as a function of angle of incidence and azimuth

Nanostructured silicon moth-eye arrays for the purpose of antireflectivity in silicon solar cells were previously optimised and fabricated using nanoimprint lithography. Optical properties of these structures in response to wavelength, angle of incidence, polarisation and azimuth orientation are studied using a bespoke reflectometer. Results revealed the huge effect of pillar profile on the normal and angular reflectance of the moth-eye arrays, moderate wavelength dependency of the reflectance of these structures and the independence of reflectance on azimuth orientation of the moth-eye array to the incident light