Reusable Moth-Eye nano-patterned PDMS sticker with a versatile function of coating for photovoltaics

Using PDMS, moth-eye nano-patterned anti-reflective coatings(ARCs) which are protuberant, aspect ratio >1 long and truncated corn-like shape are fabricated for both the photovoltaic efficiency enhancement and the device surface protection. Here, the nanostructured PDMS was replicated by soft imprint lithography using Si master prepared through colloidal lithography. We have two novelties in this work. The first, in contrast with the previously reported ARCs which are fixed in the device itself, the moth-eye nano-patterned PDMS ARC of this work is free from the device just like a sticker with the ability both repeatedly attachable and easily detachable. And the second, it is state of the art to make the protuberantly nano-patterned PDMS with high aspect ratio (>1), taking into account the fabrication difficulty attributed to PDMS nanostructures’ collapse and clustering while hollow patterns on PDMS are well researched. The PDMS film of this work is expected widely applicable thus useful to such devices as flat panel displays, photodetectors, photovoltaics, etc.