Patent ID: 9508560
Filing Date: 2016-11-29
CPC Classification: H01L

Claim Text:
1. A method of forming a semiconductor structure comprising: forming a plurality of sidewall image transfer (SIT) spacers over a metal nitride hard mask layer located over at least one underlying material layer; forming a patterned stack that comprises a patterned silicon-containing antireflective coating (SiARC) layer overlying a patterned organic planarization layer (OPL) over the SIT spacers and the metal nitride hard mask layer, the patterned stack exposing at least one portion of the plurality of SIT spacers; exposing the patterned SiARC layer to an etching gas comprising a nitrogen gas to modify the patterned SiARC layer; and treating the modified patterned SiARC layer with an aqueous solution comprising dilute hydrofluoric acid to remove the modified patterned SiARC layer from a top surface of the patterned OPL, wherein the dilute hydrofluoric acid comprises a part of hydrofluoric acid and 50 to 10000 parts of deionized water.