Dummy poly removal in FinFET technology node

Abstract

When CMOS technology reaches 14nm and beyond, FinFET is implemented to further improve the device performance. Dummy poly removal process works as a key process to control the work function of metal gate, threshold voltage, and gate leakage. In this paper, we compared the dry etch process on 3 different commercial tools with 2 different approaches which shows that the gate leakage could have more than an order's improvement with proper process and approach.