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Proceedings Paper

Development of an automated optical system for the analysis of etch pits density and distribution on semiconductor materials
Author(s): Berenice Anina Dedavid; Eleani Maria da Costa; Andre Borin Soares
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Paper Abstract

In this paper we present results related to the development of an alternative and non-destructive method for determining and mapping the etch pits density, in real time, by using digital imaging processing in association with an optical system. The density and distribution of the dislocation etch pits were obtained by the specular reflection produced by either a He-Ne laser or a white light on an etched semiconductor material surface. As the pits related to dislocations have a typical geometric form according to crystallographic plane of the surface they become more evident than other defects and, as a consequence this allows to reach selectivity for this specific defect by the system. The efficiency of the suggested method was accomplished by comparing the results obtained with conventional analysis done by optical microscopy. The proposed automated system demonstrated to be capable of covering large surface areas very rapidly, if compared to a traditional method in view of the fact that by using optical microscopy the density and distribution of defects can be determined only in the small regions which makes the mapping of the entire sample laborious. Furthermore, this system can be easily adapted to a line production providing direct qualitative and quantitative information on the substrate quality.

Paper Details

Date Published: 2 November 2000
PDF: 7 pages
Proc. SPIE 4099, Optical Metrology Roadmap for the Semiconductor, Optical, and Data Storage Industries, (2 November 2000); doi: 10.1117/12.405816
Show Author Affiliations
Berenice Anina Dedavid, Pontifical Catholic Univ. of Rio Grande of Sul (Brazil)
Eleani Maria da Costa, Pontifical Catholic Univ. of Rio Grande of Sul (Brazil)
Andre Borin Soares, Pontifical Catholic Univ. of Rio Grande of Sul (Brazil)

Published in SPIE Proceedings Vol. 4099:
Optical Metrology Roadmap for the Semiconductor, Optical, and Data Storage Industries
Ghanim A. Al-Jumaily; Angela Duparre; Bhanwar Singh, Editor(s)

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