Angle-Resolved Reflection Spectroscopy of Sub-Wavelength Surface Mie Resonators

The development of techniques that can minimize reflection of semiconductor surfaces is vital in achieving efficiency improvements for a whole range of photovoltaic technologies. Here we investigate, through an experimental study, a relatively new antireflective scheme based on subwavelength Mie resonators and compare it to another class of subwavelength structures, the so called ‘moth-eye’ array, for its ability to reduce reflectance of the solar spectrum from the surface of silicon. We show that correctly designed Mie resonator arrays have the potential to outperform moth-eye arrays and reduce reflectance to low levels over the wide range of illumination angles and spectral conditions experienced by a fixed solar cell over the course of a day.

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