Patent ID: 8143143
Filing Date: 2012-03-27
Classification: B01J,B82Y,C23C,H01L,H01M,Y02E,Y10S

Abstract:
1. A process for etching a silicon-containing substrate to form structures, comprising the steps of: (a) depositing nanoparticles on the surface of a silicon-containing substrate, (b) depositing metal on top of the nanoparticles and silicon in such a way that the metal is present and touches silicon where etching is desired and is blocked from touching silicon or not present elsewhere, and (c) contacting the metallized substrate with an etchant aqueous solution comprising about 2 to about 49 weight percent HF and an oxidizing agent, wherein the process results in nanowire arrays in which the average diameter of the nanowires is less than about 125 nm.