Reducing the reflection of nanowhiskers on dielectric composite pyramids

Abstract

A subwavelength structure was fabricated on a textured dielectric composite by nanolithography and dry etching. The facet of the textured surface was covered with many nanospheres as masks and then engraved into whiskerlike nanostructures. These nanowhiskers can absorb light efficiently, even under large-angle oblique illumination. When the nanowhisker structure was applied to solar cells, it provided 20.81% improvement in short-circuit current compared with a similar subwavelength structure, composed of a single-layer dielectric. At an incidence angle of 80°, the proposed solar cell achieved a 51.1% reduction in short-circuit current degradation.