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Proceedings Paper

High speed optical metrology solution for after etch process monitoring and control
Author(s): Anne-Laure Charley; Philippe Leray; Wouter Pypen; Shaunee Cheng; Alok Verma; Christine Mattheus; Baukje Wisse; Hugo Cramer; Henk Niesing; Stefan Kruijswijk
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Paper Abstract

Monitoring and control of the various processes in the semiconductor require precise metrology of relevant features. Optical Critical Dimension metrology (OCD) is a non-destructive solution, offering the capability to measure profiles of 2D and 3D features. OCD has an intrinsic averaging over a larger area, resulting in good precision and suppression of local variation. We have studied the feasibility of process monitoring and control in AEI (after etch inspection) applications, using the same angular resolved scatterometer as used for CD, overlay and focus metrology in ADI (after develop inspection) applications1. The sensor covers the full azimuthal-angle range and a large angle-of-incidence range in a single acquisition. The wavelength can be selected between 425nm and 700nm, to optimize for sensitivity for the parameters of interest and robustness against other process variation. In this paper we demonstrate the validity of the OCD data through the measurement and comparison with the reference metrology of multiple wafers at different steps of the imec N14 fabrication process in order to show that this high precision OCD tool can be used for process monitoring and control.

Paper Details

Date Published: 2 April 2014
PDF: 9 pages
Proc. SPIE 9050, Metrology, Inspection, and Process Control for Microlithography XXVIII, 90501H (2 April 2014); doi: 10.1117/12.2047280
Show Author Affiliations
Anne-Laure Charley, IMEC (Belgium)
Philippe Leray, IMEC (Belgium)
Wouter Pypen, IMEC (Belgium)
Shaunee Cheng, IMEC (Belgium)
Alok Verma, ASML Netherlands B.V. (Netherlands)
Christine Mattheus, ASML Netherlands B.V. (Netherlands)
Baukje Wisse, ASML Netherlands B.V. (Netherlands)
Hugo Cramer, ASML Netherlands B.V. (Netherlands)
Henk Niesing, ASML Netherlands B.V. (Netherlands)
Stefan Kruijswijk, ASML Netherlands B.V. (Netherlands)

Published in SPIE Proceedings Vol. 9050:
Metrology, Inspection, and Process Control for Microlithography XXVIII
Jason P. Cain; Martha I. Sanchez, Editor(s)

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