Patent ID: 8193095
Filing Date: 2012-06-05
Classification: B82Y,H01L,Y02E,Y02P,Y10S

Abstract:
1. A method for forming a silicon trench, comprising the steps of: providing a silicon substrate; forming a patterned etching-barrier layer on the silicon substrate, thereby defining an etching area; forming a plurality of metal catalysts on the etching area; immersing the silicon substrate in a first etching solution to etch silicon under the metal catalysts in an anisotropic direction, the remained silicon forming a plurality of silicon nanostructures; immersing the silicon substrate in a second etching solution, resulting a side etching between the silicon nanostructures and the silicon substrate, thereby substantially detaching the silicon nanostructures from the silicon substrate; and removing the silicon nanostructures, the metal catalysts, and the etching-barrier layer, thereby forming the silicon trench.