Patent ID: 8470190
Filing Date: 2013-06-25
Classification: H01L,H01M,Y02E

Abstract:
1. A method for processing at least one wall of an opening formed in a silicon substrate, successively comprising the steps of: (a) implanting fluorine atoms into an upper portion of the wall of the opening; (b) performing an oxidization of the wall of the opening; and (c) etching at least a portion of a non-implanted portion of the wall of the opening or implanting a dopant therein, wherein the non-implanted portion of the wall of the opening is located below the upper portion of the wall of the opening, wherein step (a) is preceded by the steps of: forming an oxide layer on the opening wall; implanting dopants into the oxide layer at the level of said upper portion of the wall and at the level of an intermediary portion of the wall located under the upper portion of the wall, the dopants being selected from the group consisting of boron, phosphorus and arsenic; and removing the oxide which has been doped at the level of the upper and intermediary portions of the wall.