Patent ID: 9293363
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A method of forming a semiconductor structure, comprising: depositing a first dielectric layer on a semiconductor substrate; depositing a first layer of direct self-assembly (DSA) material on the first dielectric layer; performing a phase separation of the first layer of DSA material into a first phase region and a second phase region; selectively etching one phase region of the first phase region and second phase region of the first layer of DSA material; forming cavities in the first dielectric layer; depositing a metal fill layer in the cavities of the first dielectric layer; depositing a second layer of DSA material over the metal fill layer; performing a phase separation of the second layer of DSA material into a first phase region and a second phase region; selectively etching one phase region of the first phase region and second phase region of the second layer of DSA material; forming cavities in the metal fill layer; and depositing a second dielectric layer over the metal fill layer and in the metal layer cavities.