Patent ID: 8592318
Filing Date: 2013-11-26
Classification: H01L

Abstract:
1. A method for etching an etch layer disposed over a substrate and below an antireflective coating (ARC) layer and a patterned organic mask with mask features, the method comprising: (a) placing the substrate in a process chamber; (b) opening the ARC layer through the mask features of the patterned mask; (c) forming an oxide spacer deposition layer, the oxide spacer deposition layer including a top portion, side walls, and a bottom portion, the top portion covering a top of the organic mask, the side walls covering side walls of the organic mask, and the bottom portion covering a bottom of the mask features; (d) partially removing, by etching, the oxide spacer deposition layer on the organic mask, at least the top portion of the oxide spacer deposition layer being removed; (e) removing, by etching, the organic mask and the ARC layer; (f) etching the etch layer through the sidewalls of the oxide spacer deposition layer; and (g) removing the substrate from the process chamber, wherein (c) forming the oxide spacer deposition layer comprises a plurality of cycles, each cycle comprising: a deposition phase including: providing a flow of a deposition gas containing Si; forming a plasma from the deposition gas; and stopping the flow of the deposition gas; and a treatment phase including: providing a flow of a treatment gas containing at least one of O forming a plasma from the treatment gas; and stopping the flow of the treatment gas.