Patent ID: 9460933
Filing Date: 2016-10-04
CPC Classification: H01L

Claim Text:
1. A patterning method, comprising: providing a material layer; forming a plurality of mask structures on the material layer, wherein each of the mask structures comprises a first mask layer and a first photoresist layer in sequence starting at the material layer; conformally forming a second mask layer covering the mask structures on the material layer; forming a first sacrificed layer at least on the second mask layer between the mask structures; removing a part of the first sacrificed layer and a part of the second mask layer to expose the first photoresist layer, so as to form a first U-shape mask layer between the adjacent mask structures; removing the first photoresist layer and the first sacrificed layer; conformally forming a third mask layer on the first mask layer and the first U-shape mask layer, wherein the third mask layer has a first surface and a second surface, and the first surface is higher than the second surface; forming a second sacrificed layer at least on the second surface of the third mask layer; removing a part of the second sacrificed layer and a part of the third mask layer to expose protrusions of the first U-shape mask layer, so as to form a second U-shape mask layer between the protrusions of the first U-shape mask layer; and removing the protrusions of the first U-shape mask layer and the second sacrificed layer by using the protrusions of the second U-shape mask layer as a mask; and removing the second U-shape mask layer located between the protrusions of the second U-shape mask layer, the first mask layer, the first U-shape mask layer and the material layer not covered by the protrusions of the second U-shape mask layer.