Lithography challenges of dual-damascence process in 0.13 um era

Li-Jui Chen; Lin-Hung Shiu; Chern-Shyan Tsai; Ching-Hsu Chang; Tsung-Kuei Kang; Shuo-Yen Chou

doi:10.1117/12.435791

14 September 2001 Lithography challenges of dual-damascence process in 0.13 μm era

Li-Jui Chen, Lin-Hung Shiu, Chern-Shyan Tsai, Ching-Hsu Chang, Tsung-Kuei Kang, Shuo-Yen Chou

Proceedings Volume 4346, Optical Microlithography XIV; (2001) https://doi.org/10.1117/12.435791
Event: 26th Annual International Symposium on Microlithography, 2001, Santa Clara, CA, United States

Abstract

In an attempt to develop the dual damascene process in 0.13 micrometer design rule, the trench optics, resist usage, reflectivity control and BARC strategy for 0.18 micrometer S/L on 0.20 micrometer via dual damascene process are discussed. The difficulty of 0.18 micrometer trench process will be concentrated by two reasons: First, the trench optics is totally different from the traditional L/S patterns either observing the pupil plane wave vector or the aerial image versus defocus, it contains the intrinsic limitation to drive and enough process DOF. Secondly, the PR residues remain in via due to the weak light incidence into via as soon as trench exposure. The side issues are the MEEF problem in dark field exposure and lens aberration problem enhanced in the use of PSM or some kinds of special customized illumination filter CIFs. As a result, the negative resist together with NA equals 0.55, (sigma) equals 0.8, annular 1/2 illumination were applied, it reveals that all mentioned issues are properly compromised by this optimized condition. It is also found that the PR window and profile is quite sensitive to substrate acidity and reflectivity. When BARC protecting coating and reflectivity control problems are taken into account simultaneously, the thin conformal BARC and fully filled polymer on dual SiO_XN_Y underlayer are introduced to get a good profile and CD control. Experimental results exhibit the feasibility in manufacturing.

Citation Download Citation

Li-Jui Chen, Lin-Hung Shiu, Chern-Shyan Tsai, Ching-Hsu Chang, Tsung-Kuei Kang, and Shuo-Yen Chou "Lithography challenges of dual-damascence process in 0.13 μm era", Proc. SPIE 4346, Optical Microlithography XIV, (14 September 2001); https://doi.org/10.1117/12.435791

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