Patent ID: 9553102
Date: 2017-01-24
CPC Classifications: C23F,H01J,H01L

Claim:
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 first fluorine-containing precursor into a chamber plasma region within the substrate processing chamber and exciting the first fluorine-containing precursor in a first remote plasma in the chamber plasma region to produce first plasma effluents, wherein the chamber plasma region is fluidly coupled with the substrate processing region through a showerhead and the first remote plasma is capacitively-coupled; flowing the first plasma effluents into the substrate processing region through the showerhead and isotropically etching the electrically-shorted tungsten slabs; flowing a second fluorine-containing precursor into a remote plasma system outside the substrate processing chamber and exciting the second fluorine-containing precursor in a second remote plasma with an external remote plasma power in the remote plasma system to produce second plasma effluents, wherein the second remote plasma is inductively-coupled with the external remote plasma power of between 2,000 watts and 10,000 watts; flowing the second plasma effluents into the substrate processing region; and anisotropically etching additional tungsten material.