THEORETICAL DISCUSSION OF DIFFUSION EFFECTS IN NEGATIVE CHEMICALLY AMPLIFIED RESISTS BASED ON CONTRAST CURVE SIMULATION

Gel formation theory is discussed in the case of chemically amplified resists (CARs) and a specific epoxy-based resist is used in order to m odel the results. It is found that existing gel formation models may b e classified in four classes and there are two important parameters (i nhibitor activity and maximum number of available crosslinkable sites) which must be specially interpreted in order to account for chemical amplification and diffusion mechanisms in CARs. It is also proved that a Charlesby-Pinner representation of the gel-dose relationship reveal s qualitative characteristics of the process and composition changes. (C) 1997 American Vacuum Society.