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Proceedings Paper

Pattern accuracy and throughput optimization for an SLM-based 248-nm DUV laser mask pattern generator
Author(s): Henrik Sjoberg; Jean-Michel Chauvet; Jan Harkesjo; Peter Hogfeldt; Andrzej Karawajczyk; Johan Karlsson; Lars Kjellberg; Jonas Mahlen; Angela Beyerl; Jukka Vedenpaa; Robin Goodoree; Mans Bjuggren; Johan Aman
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Paper Abstract

With each new technology generation, photomask manufacturing faces increasing complexity due to shrinking designs and accelerating use of reticle enhancement techniques. Denser and more complex patterns on the mask result in lower yields and long write and turn-around times, important factors for the rapidly increasing mask related costs in IC manufacturing. Laser pattern generators operating at DUV wavelengths were recently introduced to provide cost effective alternatives to electron-beam systems for printing of high-end photomasks. DUV wavelengths provide the required resolution and pattern fidelity. Optical tools that use raster writing principles and massively parallel printing ensure short and predictable write times for photomasks almost independent of pattern complexity. One such high-volume production system, the Sigma7300, uses spatial light modulator (SLM) technology and a 248 nm excimer laser for printing. Partially coherent imaging and multi-pass printing as in a lithography scanner further increases resolution and pattern accuracy. With four-pass printing the system provides resolution and pattern accuracy meeting mask requirements for critical layers at the 90-nm node and sub-critical layers at the 65-nm node and beyond. The paper discusses how mask layout can be optimized to take full advantage of the speed potential provided by the SLM-based writer. It shows how flexible use of the writing principle can provide cost effective writing solutions for many layers in high-end mask sets. Resolution and pattern accuracy results from the Sigma7300 will be presented together with write times for different types of designs.

Paper Details

Date Published: 20 August 2004
PDF: 11 pages
Proc. SPIE 5446, Photomask and Next-Generation Lithography Mask Technology XI, (20 August 2004); doi: 10.1117/12.557805
Show Author Affiliations
Henrik Sjoberg, Micronic Laser Systems AB (Sweden)
Jean-Michel Chauvet, Micronic Laser Systems AB (Sweden)
Jan Harkesjo, Micronic Laser Systems AB (Sweden)
Peter Hogfeldt, Micronic Laser Systems AB (Sweden)
Andrzej Karawajczyk, Micronic Laser Systems AB (Sweden)
Johan Karlsson, Micronic Laser Systems AB (Sweden)
Lars Kjellberg, Micronic Laser Systems AB (Sweden)
Jonas Mahlen, Micronic Laser Systems AB (Sweden)
Angela Beyerl, Micronic Laser Systems AB (Sweden)
Jukka Vedenpaa, Micronic Laser Systems AB (Sweden)
Robin Goodoree, Micronic Laser Systems AB (Sweden)
Mans Bjuggren, Micronic Laser Systems AB (Sweden)
Johan Aman, Micronic Laser Systems AB (Sweden)

Published in SPIE Proceedings Vol. 5446:
Photomask and Next-Generation Lithography Mask Technology XI
Hiroyoshi Tanabe, Editor(s)

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