Patent ID: 8748323
Filing Date: 2014-06-10
Classification: H01L

Abstract:
1. A patterning method, comprising: providing a substrate with an upper surface, the substrate has an objective material layer thereon, wherein the objective material layer is a multi-layer structure comprising a barrier layer, a metal layer and an anti-reflection layer sequentially formed on the substrate; forming a mask layer with a lower surface on the objective material layer; forming a material layer comprising a metal-containing substance on the mask layer, wherein a thickness of the material layer is between 200 and 400 angstroms; forming a patterned photoresist layer on the material layer, wherein the patterned photoresist layer with a line width less than 80 nm or the patterned photoresist layer is used to form a space with a gap width less than 80 nm, and a thickness of the patterned photoresist layer is 200 to 1200 angstroms; using the patterned photoresist layer as a mask, etching the material layer to form a plurality of etched first layers, wherein a first opening having a first width is formed between two opposite sidewalls of the two adjacent etched first layer; etching the mask layer to form a second opening by using the two opposite sidewalls of the adjacent etched first layer as an etching mask, wherein the second opening has a second width on the lower surface; and forming a third opening having the second width in the objective material layer to expose the upper surface of the substrate.