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An In Situ End-Point Detection System Using Motor Power Signal for Chemical Mechanical Planarization Process

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Abstract:

Accurate determination of a chemical mechanical planarization (CMP) process reaching the end point is an important problem in the CMP process. In present work, the variation of the motor power signal of the polishing platen in the CMP process has been investigated, and the moving average method with 121-points moving window was used to smooth the original signal curve. Experiment results showed that the processed signal could facilitate the extraction of end-point feature for the in-situ end-point detection (EPD) system and it was relatively steady before and after the layer transition stage, which made it more reliable to detect the end point in situ. Comparing with other EPD methods, the system was less complicated, and it was easier to code for algorithm development. Finally, further analysis was performed and series of experiments provided a planarized via-revealed surface with low via dishing.

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Periodical:

Key Engineering Materials (Volume 739)

Pages:

75-80

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.739.75

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Online since:

June 2017

Authors:

Hong Kai Li*, Tong Qing Wang, De Wen Zhao, Jianbin Luo, Xin Chun Lu

Keywords:

Chemical Mechanical Planarization, End-Point Detection, Motor Power

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© 2017 Trans Tech Publications Ltd. All Rights Reserved

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