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Open Access Nano Express

The mechanism of galvanic/metal-assisted etching of silicon

Kurt W Kolasinski

Author Affiliations

Department of Chemistry, West Chester University, West Chester, PA 19383-2115, USA

Nanoscale Research Letters 2014, 9:432  doi:10.1186/1556-276X-9-432

Published: 26 August 2014

Abstract

Metal-assisted etching is initiated by hole injection from an oxidant catalyzed by a metal nanoparticle or film on a Si surface. It is shown that the electronic structure of the metal/Si interface, i.e., band bending, is not conducive to diffusion of the injected hole away from the metal in the case of Ag or away from the metal/Si interface in the cases of Au, Pd, and Pt. Since holes do not diffuse away from the metals, the electric field resulting from charging of the metal after hole injection must instead be the cause of metal-assisted etching.

Keywords:
Nanowires; Porous silicon; Nanostructures; Reaction dynamics; Electron transfer; Stain etching; Galvanic etching; Metal-assisted etching