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Proceedings Paper

Electron beam inspection system for semiconductor wafer based on projection electron microscopy: II
Author(s): Tohru Satake; Nobuharu Noji; Takeshi Murakami; Manabu Tsujimura; Ichirota Nagahama; Yuichiro Yamazaki; Atsushi Onishi
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Paper Abstract

Electron beam inspection systems based on a scanning electron microscopy (EBI-SEM) had been developed and used for the yield management in the semiconductor process because of its high resolution. However, they have the restriction of inspection speed due to the space charge effect of the electrons in the focused electron beam. We have been developing the electron beam inspection system based on the projection electron microscopy (EBI-PEM), and reported the results which revealed the possibilities of detecting the defect size of less than 100nm and the data rate 600MPPS, last year. We have further improved the EBI-PEM on its secondary electron optical system (2'nd EO) for obtaining smaller aberrations and distortion. The aberrations and distortion of the improved EBI-PEM optical system have been estimated by calculation using conventional simulation program. Obtained aberration values were small enough than one necessary for attaining the spatial resolution of the target specification and a resolution has been confirmed by the experiments.

Paper Details

Date Published: 10 May 2005
PDF: 8 pages
Proc. SPIE 5752, Metrology, Inspection, and Process Control for Microlithography XIX, (10 May 2005); doi: 10.1117/12.600445
Show Author Affiliations
Tohru Satake, Ebara Corp. (Japan)
Nobuharu Noji, Ebara Corp. (Japan)
Takeshi Murakami, Ebara Corp. (Japan)
Manabu Tsujimura, Ebara Corp. (Japan)
Ichirota Nagahama, Toshiba Corp. (Japan)
Yuichiro Yamazaki, Toshiba Corp. (Japan)
Atsushi Onishi, Toshiba Corp. (Japan)

Published in SPIE Proceedings Vol. 5752:
Metrology, Inspection, and Process Control for Microlithography XIX
Richard M. Silver, Editor(s)

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