Patent ID: 9147581
Filing Date: 2015-09-29
Classification: C23F,H01J,H01L

Abstract:
1. A method of etching a substrate, comprising: (a) receiving a substrate having material for removal thereon in a reaction chamber of a reactor, wherein the reactor comprises: (b) supplying a plasma generating gas to the upper sub-chamber and generating the plasma from the plasma generating gas, (c) applying a negative bias to at least the uppermost and lowermost grids of the grid assembly, wherein the bias applied to the lowermost grid is more negative than the bias applied to the uppermost grid, and accelerating ions from the plasma in the upper sub-chamber through the grid assembly toward the substrate, (d) supplying an etching gas to the lower sub-chamber through the one or more inlets to the lower sub-chamber, and (e) etching the substrate to remove at least a portion of the material for removal, wherein the lower sub-chamber is substantially free of plasma during operations (a)-(e).