Patent ID: 8956808
Filing Date: 2015-02-17
Classification: G03F

Abstract:
1. A method, comprising: forming a template having a plurality of elements above a process layer, wherein first portions of the process layer are exposed between adjacent elements of the template; forming a directed self-assembly layer over the first exposed portions, the directed self-assembly layer having alternating etchable components and etch-resistant components; removing the etchable components of the directed self-assembly layer to expose second portions of the process layer; selectively removing at least one element of the template after forming the directed self-assembly layer to expose at least a third portion of the process layer; and etching the process layer after selectively removing the at least one element using the template and the etch-resistant components of the directed self-assembly layer as an etch mask to etch the second exposed portion of the process layer and the entire third exposed portion of the process layer, wherein non-periodic elements are defined in the process layer by the template and periodic elements are defined in the process layer by the etch-resistant components of the directed self-assembly layer, wherein forming the template comprises forming a first portion of the template, forming the directed self-assembly layer comprises forming a first portion of the directed self-assembly layer over a first portion of the first exposed portions, removing the etchable components comprises removing the etchable components of the first portion of the directed self-assembly layer, patterning the process layer comprises patterning the process layer using the first portion of the template and the etch-resistant components of the first portion of the directed self-assembly layer, and the method further comprises: