Patent ID: 9685332
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. A method for self-aligned patterning, the method comprising: providing a substrate; forming a patterned mandrel layer that includes a plurality of mandrel features, the patterned mandrel layer being formed on the substrate; depositing a first spacer layer over the mandrel layer, the first spacer layer comprising a first type of material; anisotropically etching the first spacer layer with a first etchant to leave a first set of spacers on sidewalls of the mandrel features; removing the mandrel layer; depositing a second spacer layer over remaining portions of the first set of spacers; and anisotropically etching the second spacer layer with a second etchant to form a second set of spacers on sidewalls of the first set of spacers, the second etchant being different than the first etchant, removing the first set of spacers of the first spacer layer.