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Proceedings Paper

Silicon containing polymer in applications for 193-nm high-NA lithography processes
Author(s): Sean Burns; Dirk Pfeiffer; Arpan Mahorowala; Karen Petrillo; Alexandera Clancy; Katherina Babich; David Medeiros; Scott Allen; Steven Holmes; Michael Crouse; Colin Brodsky; Victor Pham; Yi-Hsiung Lin; Kaushal Patel; Naftali Lustig; Allen Gabor; Christopher Sheraw; Phillip Brock; Carl Larson
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Paper Abstract

The ability to extend 193 nm lithography resolution depends on increasing the numerical aperture (NA) of the exposure system, resulting in smaller depth of focus, which subsequently requires use of thinner photoresists. Bottom antireflective coatings (BARCs) are a necessity, but the organic composition of current 193 nm BARCs offers poor etch selectivity to the photoresist. As a result, image transfer with thin resists is becoming increasingly difficult. It is also more challenging to control reflectivity at high numerical apertures with a thin, single layer BARC. To address these issues, IBM has developed a new class of silicon containing BARCs. These materials exhibit high etch selectivity that will significantly improve the performance of high NA 193 nm lithography. The incorporation of silicon in the backbone of the polymers comprising these BARCS affords a high etch selectivity to conventional organic resists and therefore these polymers can be used as thick planarizing BARCs. The optical constants of these BARCs have been tuned to provide good reflectivity control at NA > 1.2 These materials can also be used as part of a dual layer BARC scheme composed of the thin organosilicon based BARC coated over a planarizing organic underlayer. This scheme has also been optically tuned to provide reflectivity suppression at high incident angles. By utilizing a thick BARC, a novel contact hole shrink process is enabled that allows tapering of the sidewall angle and controlling the post-etch critical dimension (CD) bias. Structures of the silicon containing polymer, formulation chemistry, optical tunability, lithography at high NA and RIE pattern transfer are reported.

Paper Details

Date Published: 29 March 2006
PDF: 12 pages
Proc. SPIE 6153, Advances in Resist Technology and Processing XXIII, 61530K (29 March 2006); doi: 10.1117/12.657197
Show Author Affiliations
Sean Burns, IBM Thomas J. Watson Research Ctr. (United States)
Dirk Pfeiffer, IBM Thomas J. Watson Research Ctr. (United States)
Arpan Mahorowala, IBM Thomas J. Watson Research Ctr. (United States)
Karen Petrillo, IBM Thomas J. Watson Research Ctr. (United States)
Alexandera Clancy, IBM Thomas J. Watson Research Ctr. (United States)
Katherina Babich, IBM Thomas J. Watson Research Ctr. (United States)
David Medeiros, IBM Thomas J. Watson Research Ctr. (United States)
Scott Allen, IBM Microelectronics Division (United States)
Steven Holmes, IBM Microelectronics Division (United States)
Michael Crouse, IBM Microelectronics Division (United States)
Colin Brodsky, IBM Microelectronics Division (United States)
Victor Pham, IBM Microelectronics Division (United States)
Yi-Hsiung Lin, IBM Microelectronics Division (United States)
Kaushal Patel, IBM Microelectronics Division (United States)
Naftali Lustig, IBM Microelectronics Division (United States)
Allen Gabor, IBM Microelectronics Division (United States)
Christopher Sheraw, IBM Microelectronics Division (United States)
Phillip Brock, IBM Almaden Research Ctr. (United States)
Carl Larson, IBM Almaden Research Ctr. (United States)

Published in SPIE Proceedings Vol. 6153:
Advances in Resist Technology and Processing XXIII
Qinghuang Lin, Editor(s)

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