Patent ID: 9318341
Filing Date: 2016-04-19
CPC Classification: B81B,B81C,H01J,H01L

Claim Text:
1. A method for etching a substrate in a plasma etch reactor comprising: (a) depositing a polymer on surfaces of a feature formed in a substrate disposed in the etch reactor using a first reactive species formed from a first process gas comprising a polymer forming gas; (b) etching the bottom surface of the feature of the substrate in the etch reactor using a third reactive species formed from a third process gas including an etching gas, wherein a composition of gases introduced into the etch reactor changes between (a) and (b); and (c) bombarding a bottom surface of the feature with a second reactive species formed from a second process gas comprising one or more of an inert gas, an oxidizing gas, a reducing gas, or the polymer forming gas while at least one of depositing the polymer to remove at least some of the polymer disposed on the bottom surface, wherein a duration of each bombardment of the bottom surface of the feature is about 5 to about 50 percent of a duration of depositing the polymer, or etching the bottom surface to at least one of chemically or physically damage the bottom surface, wherein a duration of each bombardment of the bottom surface of the feature is about 5 to about 50 percent of a duration of etching the bottom surface.