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Chemical solution deposition of copper thin films and integration into a multilayer capacitor structure

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Abstract

Metallization layers with thicknesses well below a micron are needed for future generation multilayer ceramic devices such as capacitors and integrated passive components. In many cases, the limiting thickness for the electrode is governed by dewetting of the metals from the oxide surface. Therefore, thin, stable metallization layers with low electrical resistivities that can survive high processing temperatures are of interest for these applications. For this purpose, Cu films prepared from 2-methoxyethanol-based solutions were developed using adhesion promoters such as Ti, Zn, and Zr. The solutions were spun onto BaTiO3/SiO2/Si or SiO2/Si substrates, pyrolyzed, and annealed in a reducing ambient. The microstructure of films prepared in this way was found to be uniform and continuous at thicknesses as low as 80 nm. Cu films modified with 15 mol% Zr had electrical resistivities of about 16–17 μΩ-cm after 500°C annealing and 5–6 μΩ-cm after annealing at 900°C in a reducing ambient.

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Acknowledgments

This work was supported by KEMET Electronics Corporation.

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Authors and Affiliations

  1. Materials Science and Engineering Department, Materials Research Institute, The Pennsylvania State University, University Park, PA, 16802, USA

    Song Won Ko, Tanawadee Dechakupt, Clive A. Randall & Susan Trolier-McKinstry

  2. KEMET Electronics Corporation, 2835 KEMET way, Simpsonville, SC, 29681, USA

    Michael Randall & Azizuddin Tajuddin

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  1. Song Won Ko
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Correspondence to Song Won Ko.

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Ko, S.W., Dechakupt, T., Randall, C.A. et al. Chemical solution deposition of copper thin films and integration into a multilayer capacitor structure. J Electroceram 24, 161–169 (2010). https://doi.org/10.1007/s10832-008-9551-x

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