Patent ID: 9257300
Filing Date: 2016-02-09
CPC Classification: H01L

Claim Text:
1. A method for etching features into an etch layer disposed below a patterned mask, comprising performing at least three cycles, wherein each cycle comprises: providing by creating a plasma, an ion bombardment of the etch layer to create activated sites in parts of the etch layer exposed by the patterned mask; extinguishing the plasma; while the plasma is extinguished, exposing the etch layer to a plasma free gas comprising a plurality of fluorocarbon containing molecules, which causes the plurality of fluorocarbon containing molecules to selectively bind to the activated sites, wherein the selective binding is self limited by the number of activated sites; and providing an ion bombardment of the etch layer to initiate an etch reaction between the fluorocarbon containing molecules and the etch layer, wherein the ion bombardment of the etch layer to initiate an etch reaction causes the formation of volatile etch products formed from the etch layer and the fluorocarbon containing molecule.