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Proceedings Paper

Single Level Registration Metrology And Overlay Measurements On Production Wafers
Author(s): O. Hignette; F. Martin; M. Lacombat
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Paper Abstract

In 1987, we proposed a new concept of optical image processing well fitted to the measurements of two levels overlay and alsopattern registration. Combined on a tool, with a XY laser interferometric stage, this method allows single level absolute metrology and relative measurements between different levels of process. A method is presented to assess the range of absolute accuracy of the instrument from moderately distorted grids generated on wafer steppers, by measuring the same wafer at four flat orientations. The various errors generated by the machine, its limits and capabilities towards lens distorsions and stage errors characterization are discussed. With a precise Z axis metrology coupled to the autofocus and a flat pin recess chuck, a determination of the surface process induced deformations, on printed wafers becomes possible. Results of Z mapping repeatability are presented.

Paper Details

Date Published: 11 October 1989
PDF: 8 pages
Proc. SPIE 1138, Optical Microlithography and Metrology for Microcircuit Fabrication, (11 October 1989); doi: 10.1117/12.961757
Show Author Affiliations
O. Hignette, MICRO-CONTROLE (France)
F. Martin, MICRO-CONTROLE (France)
M. Lacombat, MICRO-CONTROLE (France)

Published in SPIE Proceedings Vol. 1138:
Optical Microlithography and Metrology for Microcircuit Fabrication
Michel J. Lacombat; Stefan Wittekoek, Editor(s)

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