Patent ID: 8124531
Filing Date: 2012-02-28
Classification: H01L

Abstract:
1. A method of filling a high aspect ratio feature provided on a partially manufactured semiconductor 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 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; introducing an activated etching material into the processing chamber; removing a portion of the layer using the activated etching material to form a remaining layer, the remaining layer having a varying level of passivation along a depth of the high aspect ratio feature and being more passivated near a feature opening than inside the feature causing a deposition rate being slower near the feature opening than inside the feature; reintroducing the tungsten-containing precursor and the reducing agent into the processing chamber; and selectively depositing an additional layer of the 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 additional layer is thicker inside the feature than near the feature opening due to the varying level of passivation along the depth of the high aspect ratio feature.