Wafer probe mark area estimation via digital image processing approach

Chau Shing Wang, Wen Liang Chang

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This article presents a digital image processing approach applied to estimate the probe mark area on semiconductor wafer pads. The value of mark area can be used to judge the acceptance of the wafer. Before wire bonding to the wafer, a probing needle contacts each pad to test the electrical characteristics of the chip. However, this contact leaves probe marks on the pad. A large probe mark area results in poor adhesion forces at the bond ball of the pad, thus leading to undesirable products. Traditionally, given the difficulty of calculating the area of the irregular probe mark, probe mark area calculations were substituted by calculating the area of the oval that is manually drawn to cover the probe mark area. Nevertheless, this method is inaccurate, and the results varied from person to person. In this article, we present an imaging processing approach to calculate the probe mark area utilizing high-magnification microscopes to capture probe mark images. Our approach is faster and more accurate compared to the traditional method.

Original languageEnglish
Pages (from-to)237-245
Number of pages9
JournalJournal of the Chinese Institute of Industrial Engineers
Volume29
Issue number4
DOIs
Publication statusPublished - 2012 Jun 1

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Image processing
Needles
Microscopes
Adhesion
Wire
Semiconductor materials
Imaging techniques
Processing

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering

Cite this

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abstract = "This article presents a digital image processing approach applied to estimate the probe mark area on semiconductor wafer pads. The value of mark area can be used to judge the acceptance of the wafer. Before wire bonding to the wafer, a probing needle contacts each pad to test the electrical characteristics of the chip. However, this contact leaves probe marks on the pad. A large probe mark area results in poor adhesion forces at the bond ball of the pad, thus leading to undesirable products. Traditionally, given the difficulty of calculating the area of the irregular probe mark, probe mark area calculations were substituted by calculating the area of the oval that is manually drawn to cover the probe mark area. Nevertheless, this method is inaccurate, and the results varied from person to person. In this article, we present an imaging processing approach to calculate the probe mark area utilizing high-magnification microscopes to capture probe mark images. Our approach is faster and more accurate compared to the traditional method.",
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Wafer probe mark area estimation via digital image processing approach. / Wang, Chau Shing; Chang, Wen Liang.

In: Journal of the Chinese Institute of Industrial Engineers, Vol. 29, No. 4, 01.06.2012, p. 237-245.

Research output: Contribution to journalArticle

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