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http://dx.doi.org/10.3740/MRSK.2005.15.6.426

Effect of Alanine on Cu/TaN Selectivity in Cu-CMP  

Park Jin-Hyung (Nano-SOI Process Laboratory, Hanyang University)
Kim Min-Seok (Nano-SOI Process Laboratory, Hanyang University)
Paik Ungyu (Department of Ceramic Engineering, Hanyang University)
Park Jea-Gun (Nano-SOI Process Laboratory, Hanyang University)
Publication Information
Korean Journal of Materials Research / v.15, no.6, 2005 , pp. 426-430 More about this Journal
Abstract
Chemical mechanical polishing (CMP) is an essential process in the production of integrated circuits containing copper interconnects. The effect of alanine in reactive slurries representative of those that might be used in copper CMP was studied with the aim of improving selectivity between copper(Cu) film and tantalum-nitride(TaN) film. We investigated the pH effect of nano-colloidal silica slurry containing alanine through the chemical mechanical polishing test for the 8(inch) blanket wafers as deposited Cu and TaN film, respectively. The copper and tantalum-nitride removal rate decreased with the increase of pH and reaches the neutral at pH 7, then, with the further increase of pH to alkaline, the removal rate rise to increase soddenly. It was found that alkaline slurry has a higher removal rate than acidic and neutral slurries for copper film, but the removal rate of tantalum-nitride does not change much. These tests indicated that alanine may improve the CMP process by controlling the selectivity between Cu and TaN film.
Keywords
Copper CMP; Alanine; Colloidal silica slurry; Slurry pH; Selectivity;
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