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- W1979677441 abstract "Phase shift masks (PSMs) were introduced to extend the limits of optical lithography. However, cleaning a MoSiON-based PSM pattern with an ammonium hydroxide/hydrogen peroxide mixture (APM), although efficient at cleaning the PSM pattern, etches the PSM layer, inducing changes in the phase angle and transmittance due to the introduction of variation of the critical dimension (CD). In this study, we investigated the effects of plasma treatment and furnace annealing on the etching of the MoSiON PSM in APM. In particular, we found that the etch behavior and surface chemical state after each treatment were correlated. We also compared variations in the CD between patterned PSM layers and blank masks. After O2 or N2 plasma treatment, the top surface of MoSiON had a thicker transition layer with an extreme increase in O, and a huge variation in CD was also observed after APM treatment. However, CD variation of the patterned MoSiON layer was minimal when the sample was first annealed in NH3 ambient gas and then subjected to APM treatment. This phenomenon may be related to an increase in the portion of the SiO2-like state at the top surface of the MoSiON PSM layer and its optimization without a change in the transition layer thickness." @default.
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- W1979677441 date "2013-10-01" @default.
- W1979677441 modified "2023-09-24" @default.
- W1979677441 title "Surface modification of the MoSiON phase shift mask to reduce critical dimension variation" @default.
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- W1979677441 doi "https://doi.org/10.1016/j.apsusc.2013.05.126" @default.
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