Patent ID: 9449846
Filing Date: 2016-09-20
CPC Classification: H01J,H01L

Claim Text:
1. A method of etching a patterned substrate, the method comprising: placing the patterned substrate in a substrate processing region of a substrate processing chamber, wherein the patterned substrate comprises electrically-shorted tungsten slabs arranged in at least one of two adjacent vertical columns, wherein a trench is disposed between the two adjacent vertical columns; flowing a fluorine-containing precursor into a remote plasma region within the substrate processing chamber and exciting the fluorine-containing precursor in a remote plasma in the remote plasma region to produce plasma effluents, wherein the remote plasma region is fluidly coupled with the substrate processing region through a showerhead and the remote plasma is capacitively-coupled; and flowing the plasma effluents into the substrate processing region through the showerhead and etching the electrically-shorted tungsten slabs, wherein an electron temperature in the substrate processing region while selectively etching the electrically-shorted tungsten slabs is below 0.5 eV, and wherein a pressure within the remote plasma region is between 5 Torr and 12 Torr during etching the electrically-shorted tungsten slabs.