Patent ID: 9099535
Filing Date: 2015-08-04
Classification: H01J,H01L

Abstract:
1. A method for depositing a metal-containing material on a substrate, the method comprising: (a) receiving a wafer substrate comprising at least one via comprising a bottom portion, at least one trench having a horizontal surface, and a field, wherein the substrate comprises an exposed metal at the bottom portion of the at least one via; (b) depositing a first portion of the metal-containing material at least over the bottom portion of the at least one via using a metal from a deposition source; (c) etching away the first portion of the metal-containing material at the bottom of the at least one via, such that an E/D (etch rate to deposition rate) ratio is greater than 1 at the bottom of the at least one via, with energetic inert gas ions without fully etching through to partially remove the first portion of the metal-containing material such that a part of the first portion of the metal-containing material remains at the bottom of the at least one via and a part of the first portion of the metal-containing material is removed from the bottom portion of the at least one via, such that the resistance of subsequently formed interconnects is reduced relative to that of interconnects formed using the first portion of the metal-containing material prior to etching, while simultaneously depositing a second portion of the metal-containing material in the trench and/or field on the wafer substrate, comprising a PVD etch/deposition process in which the wafer substrate is biased with an RF frequency source such that the etch rate at the bottom of the at least one via is greater than an etch rate on any associated horizontal trench surfaces or the field.