Passivate SiNx halftone phase shifting mask for deep ultraviolet exposure
1996
Halftone phase shift masks with a single‐layer SiNx absorption film whose stoichiometric ratio x was controlled were developed at 365 and 248 nm, respectively. Because this stoichiometric ratio x was smaller than 1.33 (Si3N4), the SiNx halftone films were unstable, especially during 248 nm exposure, causing a transmittance error. In this article, we show how to get stable SiNx film for 248 nm exposure.
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