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Proceedings Paper

Charging control through extraction field
Author(s): Bo Su; Opher Harel
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Paper Abstract

The influence of sample charging in CD measurements by a SEM based metrology system has been continuously decreased through lower electron beam landing energy, lower electron dose (a combination of lower beam current and less integration time) and faster scan speed. However, as IC industry marches towards 100 nm gate width, the demand for less than 1 nm precision CD- SEM grows. Charging continues to be the one of the biggest hurdles to reach that goal. Additional charge control measures are needed. We propose an approach to utilize extraction voltage in charge control. When varying extraction voltage strength, a CD-SEM can be tuned (through the combination of beam energy and extraction voltage) to operate at energy of balancing the total injected charge and the total emitted charge for a specific substrate. The preliminary experiment results support such a proposal.

Paper Details

Date Published: 2 June 2000
PDF: 4 pages
Proc. SPIE 3998, Metrology, Inspection, and Process Control for Microlithography XIV, (2 June 2000); doi: 10.1117/12.386455
Show Author Affiliations
Bo Su, Applied Materials (United States)
Opher Harel, Applied Materials (United States)

Published in SPIE Proceedings Vol. 3998:
Metrology, Inspection, and Process Control for Microlithography XIV
Neal T. Sullivan, Editor(s)

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