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Proceedings Paper

Improvements in resist performance towards EUV HVM
Author(s): Oktay Yildirim ; Elizabeth Buitrago; Rik Hoefnagels; Marieke Meeuwissen; Sander Wuister; Gijsbert Rispens; Anton van Oosten; Paul Derks; Jo Finders; Michaela Vockenhuber; Yasin Ekinci
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Paper Abstract

Extreme ultraviolet (EUV) lithography with 13.5 nm wavelength is the main option for sub-10nm patterning in the semiconductor industry. We report improvements in resist performance towards EUV high volume manufacturing. A local CD uniformity (LCDU) model is introduced and validated with experimental contact hole (CH) data. Resist performance is analyzed in terms of ultimate printing resolution (R), line width roughness (LWR), sensitivity (S), exposure latitude (EL) and depth of focus (DOF). Resist performance of dense lines at 13 nm half-pitch and beyond is shown by chemical amplified resist (CAR) and non-CAR (Inpria YA Series) on NXE scanner. Resolution down to 10nm half pitch (hp) is shown by Inpria YA Series resist exposed on interference lithography at the Paul Sherrer Institute. Contact holes contrast and consequent LCDU improvement is achieved on a NXE:3400 scanner by decreasing the pupil fill ratio. State-of-the-art imaging meets 5nm node requirements for CHs. A dynamic gas lock (DGL) membrane is introduced between projection optics box (POB) and wafer stage. The DGL membrane will suppress the negative impact of resist outgassing on the projection optics by 100%, enabling a wider range of resist materials to be used. The validated LCDU model indicates that the imaging requirements of the 3nm node can be met with single exposure using a high-NA EUV scanner. The current status, trends, and potential roadblocks for EUV resists are discussed. Our results mark the progress and the improvement points in EUV resist materials to support EUV ecosystem.

Paper Details

Date Published: 27 March 2017
PDF: 12 pages
Proc. SPIE 10143, Extreme Ultraviolet (EUV) Lithography VIII, 101430Q (27 March 2017); doi: 10.1117/12.2257415
Show Author Affiliations
Oktay Yildirim , ASML Netherlands B.V. (Netherlands)
Elizabeth Buitrago, Paul Scherrer Institut (Switzerland)
Rik Hoefnagels, ASML Netherlands B.V. (Netherlands)
Marieke Meeuwissen, ASML Netherlands B.V. (Netherlands)
Sander Wuister, ASML Netherlands B.V. (Netherlands)
Gijsbert Rispens, ASML Netherlands B.V. (Netherlands)
Anton van Oosten, ASML Netherlands B.V. (Netherlands)
Paul Derks, ASML Netherlands B.V. (Netherlands)
Jo Finders, ASML Netherlands B.V. (Netherlands)
Michaela Vockenhuber, Paul Scherrer Institut (Switzerland)
Yasin Ekinci, Paul Scherrer Institut (Switzerland)

Published in SPIE Proceedings Vol. 10143:
Extreme Ultraviolet (EUV) Lithography VIII
Eric M. Panning, Editor(s)

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