Mr. Justin Brewster Profile

Justin Brewster

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Proceedings Article | 23 March 2020 Presentation + Paper

Addressing metallic contaminants in the photochemical supply chain

Jad Jaber, James Hamzik, Nicholas Filipancic, Justin Brewster, Annie Xia

Proceedings Volume 11326, 1132613 (2020) https://doi.org/10.1117/12.2551646

KEYWORDS: Metals, Surface plasmons, Contamination, Ions, Molecules, Polymers, Photons, Semiconducting wafers, Photoresist materials, Silicon

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Metal contaminants are notorious yield detractors throughout semiconductor unit processes. Metallic contaminants can create small, hard-to-detect defects that can eventually result in cone defects and gate leakage. Because these contaminants are so hard to detect, it is extremely difficult to pinpoint their root cause and identify opportunities to remove them. Clean photochemicals experience many contamination opportunities between their final quality control checks at the end of manufacturing and dispense onto a wafer. The complexity of the interactions of metal contaminants and the components in photochemicals is an important consideration when designing removal methods. This challenge increases when metaloxide photoresists are introduced into high volume manufacturing, whereby metals that enhance etch resistance must remain in the formulation, while specific metal contaminants must be removed. In this paper, we will describe different types of metal contaminants in photochemicals and raw materials, review how these contaminants are removed using membrane-based technologies, and define new methodologies to better target metal in photochemicals.

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