Patent ID: 8435894
Filing Date: 2013-05-07
Classification: H01L

Abstract:
1. A method of filling a high aspect ratio feature provided on a substrate, the method comprising: introducing a tungsten-containing precursor and a reducing agent into a processing chamber; depositing a layer of a tungsten-containing material on the substrate via a chemical vapor deposition reaction between the tungsten-containing precursor and the reducing agent, such that the layer partially fills the high aspect ratio feature; and selectively removing a portion of the layer using an etching material to form a remaining layer, wherein the selective removal is performed without using an in-situ plasma and further wherein the selective removal is performed in a mass transport regime corresponding to a lower concentration of the etching material inside the high aspect ratio feature than near the opening of the high aspect ratio feature, wherein the etching material comprises multiple components, the multiple components having different relative concentrations throughout the depth of the high aspect ratio feature during the selective removal.