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논문 기본 정보

자료유형
학술저널
저자정보
Paul-Chang Lin (Fudan University) Jin-Hai Xu (Semiconductor Manufacturing International Corporation) Hong-Liang Lu (Fudan University) David Wei Zhang (Fudan University) Pei Li (Semiconductor Manufacturing International Corporation)
저널정보
대한전자공학회 JOURNAL OF SEMICONDUCTOR TECHNOLOGY AND SCIENCE Journal of Semiconductor Technology and Science Vol.17 No.3
발행연도
2017.6
수록면
319 - 325 (7page)

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Through silicon via (TSV) technology is extensively used in 3D IC integrations. The special structure of the TSV is realized by CMP (Chemically Mechanical Polishing) process with a high Cu removal rate and, low dishing, yielding fine topography without defects. In this study, we investigated the electrochemical behavior of copper slurries with various inhibitors in the Cu CMP process for advanced TSV applications. One of the slurries was carried out for the most promising process with a high removal rate (~18000 Å/Min @ 3 psi) and low dishing (~800 Å), providing good microstructure. The effects of pH value and H₂O₂ concentration on the slurry corrosion potential and Cu static etching rate (SER) were also examined. The slurry formula with a pH of 6 and 2% H₂O₂, hadthe lowest SER (~75 Å/Min) and was the best for TSV CMP. A novel Cu TSV CMP process was developed with two CMPs and an additional annealing step after some of the bulk Cu had been removed, effectively improving the condition of the TSV Cu surface and preventing the formation of crack defects by variations in wafer stress during TSV process integration.

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Abstract
Ⅰ. INTRODUCTION
Ⅱ. EXPERIMENTAL
Ⅲ. RESULTS AND DISCUSSION
Ⅳ. CONCLUSIONS
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UCI(KEPA) : I410-ECN-0101-2018-569-001033924