@misc{10481/94792,
year = {2016},
url = {https://hdl.handle.net/10481/94792},
abstract = {We demonstrate a fabrication breakthrough to produce large-area arrays of vertically aligned silicon nanowires (VA-SiNWs) with full tunability of the geometry of the single nanowires and of the whole array, paving the way toward advanced programmable designs of nanowire platforms. At the core of our fabrication route, termed “Soft Nanoparticle Templating”, is the conversion of gradually compressed self-assembled monolayers of soft nanoparticles (microgels) at a water–oil interface into customized lithographical masks to create VA-SiNW arrays by means of metal-assisted chemical etching (MACE). This combination of bottom-up and top-down techniques affords excellent control of nanowire etching site locations, enabling independent control of nanowire spacing, diameter and height in a single fabrication route. We demonstrate the fabrication of centimeter-scale two-dimensional gradient photonic crystals exhibiting continuously varying structural colors across the entire visible spectrum on a single silicon substrate, and the formation of tunable optical cavities supported by the VA-SiNWs, as unambiguously demonstrated through numerical simulations. Finally, Soft Nanoparticle Templating is combined with optical lithography to create hierarchical and programmable VA-SiNW patterns.},
organization = {Swiss National Science Foundation grant PP00P2_144646/1},
organization = {Alexander von Humboldt Foundation},
organization = {COST action (STSM MP1106-14761)},
organization = {German Research Foundation SFB985},
organization = {European Commission Marie Curie Career Integration Grant (333821)},
publisher = {American Chemical Society},
keywords = {Vertically aligned nanowires},
keywords = {Nanoscale patterning},
keywords = {Microgels},
keywords = {Fluid interfaces},
keywords = {2D photonic crystals},
keywords = {Optical cavities},
title = {Fully Tunable Silicon Nanowire Arrays Fabricated by Soft Nanoparticle Templating},
doi = {10.1021/acs.nanolett.5b03414},
author = {Rey, Marcel and Elnathan, Roey and Ditcovski, Ran and Geisel, Karen and Zanini, Michele and Fernández Rodríguez, Miguel Ángel and Naik, Vikrant V. and Frutiger, Andreas and Richtering, Walter and Ellenbogen, Tal and Voelcker, Nicolas H. and Isa, Lucio},
}