Patent ID: 7846756
Filing Date: 2010-12-07
Classification: H01L

Abstract:
1. A method of making a device, comprising: forming a first hard mask layer over an underlying layer; forming a first imprint resist layer over the first hard mask layer; forming first features over the first hard mask layer by bringing a first imprint template in contact with the first imprint resist layer; forming a first spacer layer over the first features; etching the first spacer layer to form a first spacer pattern and to expose top of the first features; removing the first features; patterning the first hard mask, using the first spacer pattern as a mask, to form first hard mask features; removing the first spacer pattern; forming a second imprint resist layer over the first hard mask features; forming second features over the first hard mask features by bringing a second imprint template in contact with the second imprint resist layer; forming a second spacer layer over the second features; etching the second spacer layer to form a second spacer pattern and to expose top of the second features; removing the second features; etching the first hard mask features, using the second spacer pattern as a mask, to form second hard mask features; and etching at least part of the underlying layer using the second hard mask features as a mask.