Inventors:
Erik A. Edelberg - Castro Valley CA, US
Assignee:
Lam Research Corporation - Fremont CA
International Classification:
H01L 21/302
US Classification:
438714, 438710, 438723, 438724, 438725, 216 67, 216 68, 216 72, 216 74, 216 81
Abstract:
A method for selectively etching an ultra high aspect ratio feature dielectric layer through a carbon based mask in an etch chamber is provided. A flow of an etch gas is provided, comprising a fluorocarbon containing molecule and an oxygen containing molecule to the etch chamber. A pulsed bias RF signal is provided. An energizing RF signal is provided to transform the etch gas to a plasma.