Photoresist flow simulation using the viscous flow model

Abstract

The PR (photoresist) flow process, applied to contact patterning, is difficult to predict and optimize because a process model does not exist. In this paper, the PR flow simulation method, using a viscous flow model, is developed and applied to examine the effect of initial shape and process conditions on the PR flow phenomena. In addition, this model is used to optimize the layout with the various contacts in the real pattern. This PR flow model, linked to lithography and etch ones, can predict and optimize the contact patterning process in cell, periphery, and TEG (test element group) areas and analyze defects, considering the pre-/post-processes, systematically.