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Proceedings Paper

Challenges in LER/CDU metrology in DSA: placement error and cross-line correlations
Author(s): Vassilios Constantoudis; Vijaya-Kumar Murugesan Kuppuswamy; Evangelos Gogolides; Alessandro Vaglio Pret; Hari Pathangi; Roel Gronheid
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Paper Abstract

DSA lithography poses new challenges in LER/LWR metrology due to its self-organized and pitch-based nature. To cope with these challenges, a novel characterization approach with new metrics and updating the older ones is required. To this end, we focus on two specific challenges of DSA line patterns: a) the large correlations between the left and right edges of a line (line wiggling, rms(LWR)<rms(LER)) and b) the cross-line correlations, i.e. the resemblance of wiggling fluctuations of nearby lines. The first is quantified by the Line Center Roughness whose low-frequency part is related to the local placement errors of device structures. For the second, we propose the c-factor correlation function which quantifies the strength of the correlations between lines versus their horizontal distance in pitches. Also, we define roughness and uniformity parameters for the pitch changes along and across lines. The proposed characterization approach is applied to the analysis of line/space patterns obtained with the Liu-Nealey (LiNe) flow (post PMMA removal and pattern transfer) revealing the effects of pattern transfer on roughness and uniformity. Finally, we calculate the cfactor function of various Next-Generation Lithography techniques and reveal their distinct footprint on the extent of cross-line correlations.

Paper Details

Date Published: 25 March 2016
PDF: 11 pages
Proc. SPIE 9778, Metrology, Inspection, and Process Control for Microlithography XXX, 97781X (25 March 2016); doi: 10.1117/12.2230849
Show Author Affiliations
Vassilios Constantoudis, NCSR Demokritos (Greece)
Nanometrisis P.C. (Greece)
Vijaya-Kumar Murugesan Kuppuswamy, NCSR Demokritos (Greece)
Nanometrisis P.C. (Greece)
Evangelos Gogolides, NCSR Demokritos (Greece)
Nanometrisis P.C. (Greece)
Alessandro Vaglio Pret, KLA-Tencor Corp. (Belgium)
IMEC (Belgium)
Hari Pathangi, IMEC (Belgium)
Roel Gronheid, IMEC (Belgium)

Published in SPIE Proceedings Vol. 9778:
Metrology, Inspection, and Process Control for Microlithography XXX
Martha I. Sanchez, Editor(s)

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