Patent ID: 6855622
Filing Date: 2005-02-15
Classification: H01J,H01L

Abstract:
1. A method of forming a cavity having a cavity depth in a crystalline substrate, comprising the steps of: a) applying a charged particle beam to a surface of the substrate without an injected gas into the beam, for a time sufficient to remove defects from the surface of the substrate; b) subsequent to step a), applying to the surface of the substrate a charged particle beam with a first gas injected therein, for a time sufficient to remove a surface layer of said substrate having ions implanted therein by the charged particle beam, said surface layer having a thickness; and c) subsequent to step b), applying to the surface of the substrate a charged particle beam with a second gas injected therein, for a time sufficient to define the cavity having said cavity depth; said cavity depth being much larger than said surface layer thickness.