Patent ID: 9349604
Filing Date: 2016-05-24
CPC Classification: G03F,H01L

Claim Text:
1. A method for forming a patterned topography on a substrate, comprising: providing a patterned substrate with features formed atop, the features forming an existing topography; applying a planarization layer on the existing topography; applying an antireflective layer over the planarization layer; applying a layer of radiation-sensitive material over the antireflective layer; patterning the radiation-sensitive material layer to form an image; transferring the image into the planarization layer by etching the antireflective layer and planarization layer to expose the existing topography; stripping any remaining portions of the radiation-sensitive material layer and the antireflective layer to leave the exposed existing topography surrounded by a template for directed self-assembly (DSA) formed by remaining portions of the planarization layer; filling the template with a block copolymer (BCP) to directly contact and cover the exposed existing topography; annealing the block copolymer (BCP) within the template to drive self-assembly in alignment with the existing topography; and developing the annealed block copolymer (BCP) to expose a directed self-assembly (DSA) pattern immediately overlying the existing topography.