Patent ID: 9607834
Date: 2017-03-28
CPC Classifications: G03F,H01L

Claim:
1. A method for etching through an antireflective coating layer on a substrate, comprising: forming a film stack on the substrate, the film stack comprising an underlying organic layer, an antireflective coating layer disposed above the underlying organic layer, and a photoresist layer disposed above the antireflective coating layer; patterning the photoresist layer to expose a non-masked portion of the antireflective coating layer; selectively depositing a carbon-containing layer on the non-masked portions of the antireflective coating layer and on non-sidewall portions of the patterned photoresist layer; etching the film stack to remove the carbon-containing layer and to remove a partial thickness of the non-masked portions of the antireflective coating layer without reducing a thickness of the photoresist layer; and repeating the selective depositing and etching at least until the complete thickness of the non-masked portions of the antireflective coating layer is removed to expose the underlying organic layer.