27 March 2017 Improvements in resist performance towards EUV HVM
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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.
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Oktay Yildirim , Oktay Yildirim , Elizabeth Buitrago, Elizabeth Buitrago, Rik Hoefnagels, Rik Hoefnagels, Marieke Meeuwissen, Marieke Meeuwissen, Sander Wuister, Sander Wuister, Gijsbert Rispens, Gijsbert Rispens, Anton van Oosten, Anton van Oosten, Paul Derks, Paul Derks, Jo Finders, Jo Finders, Michaela Vockenhuber, Michaela Vockenhuber, Yasin Ekinci, Yasin Ekinci, } "Improvements in resist performance towards EUV HVM", Proc. SPIE 10143, Extreme Ultraviolet (EUV) Lithography VIII, 101430Q (27 March 2017); doi: 10.1117/12.2257415; https://doi.org/10.1117/12.2257415

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