Patent ID: 8916054
Filing Date: 2014-12-23
Classification: G03F,H01L,Y10T

Abstract:
1. A method of forming a patterned structure comprising: forming a stack comprising, from bottom to top, a substrate, a hard mask layer that is not carbon-based, a soft mask layer including a carbon-based material, and a photoresist; lithographically patterning said photoresist; and transferring a pattern in said photoresist into said soft mask layer employing an anisotropic etch, wherein a carbon-rich polymer including carbon and fluorine is formed on sidewalls around an opening of said soft mask layer, wherein an atomic ratio of carbon to fluorine is greater than 1 within said carbon-rich polymer, wherein said anisotropic etch employs a fluorohydrocarbon-containing plasma, and said carbon-rich polymer is generated by interaction of said fluorohydrocarbon-containing plasma with said soft mask layer, and wherein said fluorohydrocarbon-containing includes ions of C