Nanotech 2011 Vol. 2
Nanotech 2011 Vol. 2
Nanotechnology 2011: Electronics, Devices, Fabrication, MEMS, Fluidics and Computational

Nano Electronics & Photonics Chapter 1

Self-assembled monolayer (SAMs) and electroplating process for Cu filling on 32-nm trench

Authors: M. Hong

Affilation: Hanyang university, Korea

Pages: 88 - 91

Keywords: SAMs, electroplating, copper filling

To improve the conformality of Cu seed layer prepared by ELD, we have also developed a novel activation technique by combining a self assembled monolayer (SAM) and Au catalyst. A coupling agent to anchor Au complex ions instead of metallic catalysts on the substrate was used, which enabled a defect free Cu filling of trenches by minimizing the electrical repulsion among the Au catalysts in the solution. The Cu seed layer formed by this method showed a highly conformal and continuous structure. Cu electrodeposition on the 32-nm trench was demonstrated using an acid cupric sulfate electrolyte containing chloride, polyethylene glycol 4000 and bis(3-sulfopropyl)disulfide. The resulting electroplated Cu showed excellent filling capability and no voids or other defects were observed in a 32-nm trench pattern. Therefore, this proposed method has the potential solution to replace the Cu seed layer formation method for future Cu metalizing technology for sub-32nm features. .

ISBN: 978-1-4398-7139-3
Pages: 854
Hardcopy: $199.95