Patent ID: 9299583
Filing Date: 2016-03-29
CPC Classification: H01L

Claim Text:
1. A method of etching aluminum oxide, the method comprising: placing a patterned substrate in a substrate processing region of a substrate processing chamber, wherein the patterned substrate comprises an exposed aluminum oxide portion; flowing a chlorine-containing precursor into a remote plasma region fluidly coupled to the substrate processing region; flowing a hydrogen-and-carbon-containing precursor into the remote plasma region; forming a remote plasma in the remote plasma region from the chlorine-containing precursor and the hydrogen-and-carbon-containing precursor to produce plasma effluents; flowing the plasma effluents into the substrate processing region through through-holes in a showerhead, wherein the showerhead is disposed between the remote plasma region and the substrate processing chamber; forming a bias plasma in the substrate processing region to further excite the plasma effluents; and etching the exposed aluminum oxide portion from the patterned substrate, wherein a temperature of the patterned substrate is below 130° C. during the operation of etching the exposed aluminum oxide portion.