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IJAT Vol.9 No.5 pp. 573-579
doi: 10.20965/ijat.2015.p0573
(2015)

Paper:

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Investigation into Chemical Mechanical Polishing Mechanism of Hard-to-Process Materials Using a Commercially Available Single-Sided Polisher

Michio Uneda*, Keiichi Takano*, Koji Koyama**, Hideo Aida**, and Ken-ichi Ishikawa*

*Kanazawa Institute of Technology
7-1 Ohgigaoka, Nonoichi, Ishikawa 921-8501, Japan

**Namiki Precision Jewel Co., Ltd.
3-8-22 Shin-den, Adachi, Tokyo 123-8511, Japan

Received:
February 3, 2015
Accepted:
July 13, 2015
Published:
September 5, 2015
Creative Commons License
Keywords:
chemical mechanical polishing, hard-to-process materials, removal rate, slurry flow between wafer and polishing pad during CMP, polisher vibration acceleration
Abstract
Chemical mechanical polishing (CMP) is one of the most important processes for fabricating highly planarized substrates such as sapphire for light emitting diodes (LEDs). However, sapphire is categorized as a hard-to-process material; therefore, a long processing time is required because of the low polishing efficiency (i.e., removal rate). This study investigates the CMP mechanism for hard-to-process materials using the following polishing evaluation parameters: (1) the velocity ratio, which is defined as the ratio of slurry flow velocity between the wafer and polishing pad during CMP to the pad tangential velocity, (2) the standard deviation of the velocity ratio distribution, and (3) the polisher vibration acceleration during CMP. Each parameter was measured at five rotational speeds and two polishing pressures for a total of ten conditions using a commercially available single-sided polisher. Moreover, the influence of each parameter on the removal rate was demonstrated via a multiple correlation analysis. As a result, we revealed that the velocity ratio and polisher vibration acceleration are strongly related with the removal rate.
Cite this article as:
M. Uneda, K. Takano, K. Koyama, H. Aida, and K. Ishikawa, “Investigation into Chemical Mechanical Polishing Mechanism of Hard-to-Process Materials Using a Commercially Available Single-Sided Polisher,” Int. J. Automation Technol., Vol.9 No.5, pp. 573-579, 2015.
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Last updated on Sep. 21, 2023