Patent ID: 9293345
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A method for forming fins, comprising: forming a trench through a stack of layers that includes a top and bottom insulator layer, and a layer to be patterned on a substrate; isotropically etching the top and bottom insulator layers; forming a hardmask material in the trench to the level of the bottom insulator layer; isotropically etching the top insulator layer; etching the bottom insulator layer and the layer to be patterned down to the substrate to form fins from the layer to be patterned; forming a hardmask material in the trench to the level of the layer to be patterned; and repeating both of said steps of forming hardmask material in the trench and both of said steps of isotropically etching until a predetermined number of fins have been formed.