title: Metal-assisted chemical etching of silicon: a review.
abstract: This article presents an overview of the essential aspects in the fabrication of silicon and some silicon/germanium nanostructures by metal-assisted chemical etching. First, the basic process and mechanism of metal-assisted chemical etching is introduced. Then, the various influences of the noble metal, the etchant, temperature, illumination, and intrinsic properties of the silicon substrate (e.g., orientation, doping type, doping level) are presented. The anisotropic and the isotropic etching behaviors of silicon under various conditions are presented. Template-based metal-assisted chemical etching methods are introduced, including templates based on nanosphere lithography, anodic aluminum oxide masks, interference lithography, and block-copolymer masks. The metal-assisted chemical etching of other semiconductors is also introduced. A brief introduction to the application of Si nanostructures obtained by metal-assisted chemical etching is given, demonstrating the promising potential applications of metal-assisted chemical etching. Finally, some open questions in the understanding of metal-assisted chemical etching are compiled.
authors.affiliation: Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle, Germany. zphuang@ujs.edu.cn
authors.forename: Zhipeng
authors.initials: Z
authors.lastname: Huang
authors.forename: Nadine
authors.initials: N
authors.lastname: Geyer
authors.forename: Peter
authors.initials: P
authors.lastname: Werner
authors.forename: Johannes
authors.initials: J
authors.lastname: de Boor
authors.forename: Ulrich
authors.initials: U
authors.lastname: Gösele
mesh_terms: D008029:Lighting; D008670:Metals / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods*; D012666:Semiconductors; D012825:Silicon / Q000737:chemistry*; D013696:Temperature
chemical_list: D008670:Metals; D012825:Silicon