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Proceedings Paper

Electron-beam lithography of isolated trenches with chemically amplified positive resist
Author(s): Andrew R. Eckert; Richard J. Bojko; Harold Gentile; Robert Harris; Jay Jayashankar; Earl Johns; Kevin Minor; Keith Mountfield; Carl Seiler; XiaoMin Yang
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Paper Abstract

Electron beam lithography has been implemented with a commercially available DUV chemically amplified positive resist. Post exposure delay stability in vacuum was found to be non-critical. Post exposure delay after removal from vacuum in our clean room is a critical variable, with a change in critical dimension of approximately 0.6 nm per minute of PEB delay. This result was achieved without amine filtration. Wafers were transported in cassettes from the e- beam exposure tool to an FSI Polaris 2000 photocluster tool. The PEB delay effect on critical dimensions can be significantly reduced by using a water soluble protective top coat with a slight change in nominal does. E-beam lithography was performed with a Leica VB6 operating at 50eV, using a n 800 micrometers field, and a 12.5 nm minimum grid size. The original CAD had a negative bias added to compensate for any proximity effect, to take advantage of dose control to achieve targeted line width, and to optimize exposure latitude. Characterization with a dual beam FIB/SEM to obtain cross-sectional SEM images, typically demonstrate a foot on plated structures from the initial resist profile. A 30 percent decease in nominal dose was observed on device wafers compared to scout wafers. Device wafers have metal structures buried below the approximate 100 nm thick plating seed layer that also cause profile changes. This is presumably due to the back scattering of the electrons from the initial area of exposure. Plating rates in isolated trenches also show a strong dependence o n the critical dimension of the narrow resist trench. Plated structures with critical dimensions of 80 nm in 0.65 microns of resist were fabricated.

Paper Details

Date Published: 1 July 2002
PDF: 10 pages
Proc. SPIE 4688, Emerging Lithographic Technologies VI, (1 July 2002); doi: 10.1117/12.472361
Show Author Affiliations
Andrew R. Eckert, Seagate Research (United States)
Richard J. Bojko, Seagate Research (United States)
Harold Gentile, Seagate Research (United States)
Robert Harris, Seagate Research (United States)
Jay Jayashankar, Seagate Research (United States)
Earl Johns, Seagate Research (United States)
Kevin Minor, Seagate Research (United States)
Keith Mountfield, Seagate Research (United States)
Carl Seiler, Seagate Research (United States)
XiaoMin Yang, Seagate Research (United States)

Published in SPIE Proceedings Vol. 4688:
Emerging Lithographic Technologies VI
Roxann L. Engelstad, Editor(s)

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