Alternative stitching method for massively parallel e-beam lithography

Pieter Brandt; Céline Tranquillin; Marco Wieland; Sébastien Bayle; Matthieu Milléquant; Guillaume Renault

doi:10.1117/12.2085292

19 March 2015 Alternative stitching method for massively parallel e-beam lithography

Pieter Brandt, Céline Tranquillin, Marco Wieland, Sébastien Bayle, Matthieu Milléquant, Guillaume Renault

Proceedings Volume 9423, Alternative Lithographic Technologies VII; 942312 (2015) https://doi.org/10.1117/12.2085292
Event: SPIE Advanced Lithography, 2015, San Jose, California, United States

Abstract

In this study a novel stitching method other than Soft Edge (SE) and Smart Boundary (SB) is introduced and benchmarked against SE. The method is based on locally enhanced Exposure Latitude without cost of throughput, making use of the fact that the two beams that pass through the stitching region can deposit up to 2x the nominal dose. The method requires a complex Proximity Effect Correction that takes a preset stitching dose profile into account. On a Metal clip at minimum half-pitch of 32 nm for MAPPER FLX 1200 tool specifications, the novel stitching method effectively mitigates Beam to Beam (B2B) position errors such that they do not induce increase in CD Uniformity (CDU). In other words, the same CDU can be realized inside the stitching region as outside the stitching region. For the SE method, the CDU inside is 0.3 nm higher than outside the stitching region. 5 nm direct overlay impact from B2B position errors cannot be reduced by a stitching strategy.

Citation Download Citation

Pieter Brandt, Céline Tranquillin, Marco Wieland, Sébastien Bayle, Matthieu Milléquant, and Guillaume Renault "Alternative stitching method for massively parallel e-beam lithography", Proc. SPIE 9423, Alternative Lithographic Technologies VII, 942312 (19 March 2015); https://doi.org/10.1117/12.2085292

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