Skip to main content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Black GaAs with Sub-Wavelength Nanostructures Fabricated via Lithography-Free Metal-Assisted Chemical Etching

Published

Author(s)

Kristine A. Bertness, Thomas Wilhelm, Alex Kohlberg, Mohadeseh Baboli, Alireza Abrand, Parsian Mohseni

Abstract

A highly practical nanofabrication process is detailed here for the generation of black GaAs. Discontinuous thin films of Au nanoparticles are electrodeposited onto GaAs substrates to catalyze site-specific etching in a solution of KMnO4 and HF according to the metal-assisted chemical etching mechanism. This provides a completely solution-based and lithography-free method for fabrication of sub-wavelength nanostructure arrays, which exhibit solar-weighted reflectance approaching 4%. This two-step benchtop process can be entirely performed at room-temperature without lithographic patterning or vacuum instrumentation, providing an alternative high- throughput nanotexturing approach for thin-film photovoltaics applications.
Citation
ECS Journal of Solid State Science and Technology
Volume
8
Issue
6

Keywords

metal-assisted chemical etching, photovoltaics
Created June 19, 2019, Updated December 19, 2019