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We have been developing the technology for phase shift masks since 1991 in order to
supply the reticles for 64 MDRAM generation and after. We are still developing both the
alternative and embedded types fori-line.
The embedded type is suitable for ASIC and contact hole. Now, we are reaching an
adequate supply of embedded type PSMs for practical use.
Currently the embedded types is relatively popular because the burden on designing is
small, the process is comparatively short, and defect repair is easier.
Yoshiro Yamada,Kazuaki Chiba,Eisei Karikawa,Hiromasa Unno,Yasutaka Kikuchi,Katsuhiro Kinemura, andMasao Otaki
"Quality control of embedded-type phase-shift mask", Proc. SPIE 2512, Photomask and X-Ray Mask Technology II, (3 July 1995); https://doi.org/10.1117/12.212785
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