Patent ID: 9034768
Filing Date: 2015-05-19
Classification: C23C,C23F,H01L

Abstract:
1. A method of filling a high aspect ratio feature provided on a partially manufactured semiconductor substrate, the feature having an opening and an interior, 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 partially manufactured semiconductor 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; flowing an etching material into the processing chamber to contact the substrate; and selectively removing a portion of the deposited layer using the etching material at process conditions including a substrate temperature of less than about 250° C. and a pressure processing chamber pressure of less than 5 Torr such that more tungsten is removed near the feature opening than in the feature interior, wherein the etching material that contacts the substrate includes atomic fluorine and molecular fluorine, and wherein the amount of the deposited layer removed by atomic fluorine is at least ten times greater than the amount of the deposited layer that is removed by molecular fluorine.