Patent ID: 9169556
Filing Date: 2015-10-27
Classification: C23C

Abstract:
1. A method of controlling nucleation in a CVD process, comprising: positioning in a processing chamber a substrate comprising both surface regions and gap regions; depositing a first nucleation layer comprising tungsten conformally over the surface regions and the gap regions; treating at least a portion of the first nucleation layer with activated nitrogen, wherein the activated nitrogen is deposited preferentially on the surface regions; reacting a first deposition gas comprising a first tungsten halide and a first hydrogen-containing gas to deposit a tungsten fill layer over the first nucleation layer, wherein the tungsten fill layer is preferentially deposited in gap regions of the substrate; reacting a nucleation gas comprising a second tungsten halide to form a second nucleation layer over the tungsten fill layer; and reacting a second deposition gas comprising a third tungsten halide and a second hydrogen-containing gas to deposit a tungsten field layer over the second nucleation layer.