Effects of wafer spin speed during dry etch post-wet cleaning on a metal line ?
Impacts of wafer spin speed during dry etch post-wet cleaning on metal lines were investigated. Polymer removability, pitting, and pattern peeling vary directly with the wafer position. Polymer removability as well as pitting were accelerated by vertical chemical injection. Pattern peeling could have occurred with the vertical chemical injection at the wafer center. High spin speed enhanced the polymer removability at the wafer edge and decreased the disparities within a wafer.
wafer spin speed single-wafer-spin wet tool etch disparities within wafer