Anisotropic silicon nanowire arrays fabricated by colloidal lithography

Rey M, Wendisch FJ, Görlitzer E, Tang J, Bader R, Bourret GR, Vogel N (2021)

Publication Language: English

Publication Type: Journal article

Publication year: 2021

Journal

Nanoscale Advances Royal Society of Chemistry

Abstract

The combination of metal-assisted chemical etching (MACE) and colloidal lithography allows for the affordable, large-scale and high-throughput synthesis of silicon nanowire (SiNW) arrays. However, many geometric parameters of these arrays are coupled and cannot be addressed individually using colloidal lithography. Despite recent advancements towards higher flexibility, SiNWs fabricated via colloidal lithography and MACE usually have circular, isotropic cross-sections inherited from the spherical templates. Here we report a facile technique to synthesize anisotropic SiNWs with tunable cross-sections via colloidal lithography and MACE. Metal films with an elliptical nanohole array can form from shadows of colloidal particles during thermal evaporation of the metal at tilted angles. The aspect ratio of these anisotropic holes can be conveniently controlled via the deposition angle. Consecutive MACE using these patterned substrates with or without prior removal of the templating spheres results in arrays of anisotropic SiNWs with either elliptical or crescent-shaped cross-sections, respectively. As a consequence of the anisotropy, long SiNWs with elliptical cross-sections preferentially collapse along their short axis, leading to a controlled bundling process and the creation of anisotropic surface topographies. These results demonstrate that a rich library of SiNW shapes and mesostructures can be prepared using simple spherical colloidal particles as masks.

Authors with CRIS profile

Marcel Rey Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Eric Görlitzer Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Nicolas Vogel Professur für Partikelsynthese

Involved external institutions

Universität Salzburg (Paris Lodron Universität Salzburg)

Austria (AT)

How to cite

APA:

Rey, M., Wendisch, F.J., Görlitzer, E., Tang, J., Bader, R., Bourret, G.R., & Vogel, N. (2021). Anisotropic silicon nanowire arrays fabricated by colloidal lithography. Nanoscale Advances. https://dx.doi.org/10.1039/d1na00259g

MLA:

Rey, Marcel, et al. "Anisotropic silicon nanowire arrays fabricated by colloidal lithography." Nanoscale Advances (2021).

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