Patent ID: 9128384
Filing Date: 2015-09-08
Classification: G03F,H01L

Abstract:
1. A method comprising: forming a bottom layer and a middle layer on the substrate, wherein the middle layer overlies the bottom layer; forming a photo resist pattern on the middle layer, wherein the photo resist pattern includes a first feature of photoresist having a top surface and two opposing sidewall surfaces; using a plasma process, depositing an etch coating layer including carbon on the photo resist pattern, wherein the depositing includes forming the etch coating layer over the two opposing sidewall surfaces of the first feature; performing a first etching process using the etch coating layer and the photo resist pattern as a masking element to pattern the middle layer; performing a second etching process, after the first etching process using the etch coating layer, the photoresist pattern, and the patterned middle layer to pattern the bottom layer, wherein at least a portion of the etch coating layer and the photoresist pattern remain on the patterned middle layer after the second etching process; and performing a third etching process of etching the substrate to form a substrate pattern in the substrate using the patterned bottom layer as a masking element, wherein the portion of the etch coating layer and the photoresist pattern is removed during the etching the substrate.