Patent ID: 9530667
Filing Date: 2016-12-27
CPC Classification: H01L

Claim Text:
1. A method of dry developing a multi-layer mask on a substrate, comprising: disposing a substrate comprising a multi-layer mask in a plasma processing system, wherein the multi-layer mask has a patterned layer defining an open feature pattern overlying a silicon-containing ARC (anti-reflective coating) layer; establishing a flow of a process gas to the plasma processing system, the process gas containing: selecting a process condition specifying a flow rate for each gaseous molecular constituent that increases an etch selectivity, measured as the ratio of the etch rate of the silicon-containing ARC layer to the etch rate of the patterned layer, relative to the etch selectivity achievable using the process condition while introducing only the first and second gaseous molecular constituents; igniting plasma from the process gas using a plasma source in accordance with the process condition; and exposing the substrate to the plasma to extend the open feature pattern of the patterned layer into the silicon-containing ARC layer.