A Study on the Impact of Polymer Additives in Bulk Copper Slurry on Copper CMP

Konferenz: ICPT 2007 - International Conference on Planarization / CMP Technology
25.10.2007 - 27.10.2007 in Dresden, Germany

Tagungsband: ICPT 2007

Seiten: 6Sprache: EnglischTyp: PDF

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Chou, Homer; Kim, Wonlae; Noh, Jongil; Lee, Inkyung (Cheil Industries Inc. 332-2 Gocheon-Dong, Uiwang-si, Gyeonggi-Do, Korea)

Polymer additives in bulk copper CMP slurries have been a crucial element in bulk copper CMP slurries; however, there are few studies in the literature which explore in detail the structure-function relationship between polymers and CMP performance. A key characteristic seems to lie in the fact that polymer additives cause the copper removal to follow non-Prestonian behavior. This, in turn, yields better planarization efficiency and thus a better final product. To offer some insight into this relationship, this study examined the impact that the physical and chemical properties of a series of carefully engineered polyacrylic acid derivatives have on the polishing performance of a standardized copper slurry formulation. The results of the investigation indicate that while molecular weight and polymer composition are important parameters, the polydispersity of the polymer is of lesser importance.