Self-aligned block and fully self-aligned via for iN5 metal 2 self-aligned quadruple patterning

Abstract

This paper assesses Self-Aligned Block (SAB) and Fully Self-Aligned Via (FSAV) approaches to patterning using a iN5 (imec node 5 nm) vehicle and Metal 2 Self-Aligned Quadruple Patterning. We analyze SAB printability in the lithography process using process optimization, and demonstrate the effect of SAB on patterning yield for a (8 M2 lines x 6 M1 lines x 6 Via) structure. We show that FSAV, compared to standard Via patterning, has no beneficial impact but prevents dielectric breakdown between two adjacent M1 lines.