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Selective Aluminum CVD for Sub-Micron VIA Plug Filling

  • N. Zhu (a1), S. K. Jo (a1), M. B. Freiler (a1), R. Scarmozzino (a1), R. M. Osgood (a1) and T. Cacouris (a2)...

Abstract

We present a novel technique to metallize high-aspect-ratio, small-dimension contact holes and via plugs for application to integrated circuits and packaging. The technique uses a laser-assisted process to deposit a thin film of aluminum from DMA1H, which forms a seed layer for subsequent selective CVD. The resistivity of the deposited aluminum is nearly that of the bulk metal, the contact resistivity is good (∼0.03 μΩ-cm2), and the morphology of the deposited film is comparable to that obtained with physical vapor deposition. This process has been used to fill via holes in a SiO2 substrate, and small-diameter (0.7 μm), high-aspect-ratio (3:1), aluminum plugs have been repeatedly formed without the incorporation of voids. A custom-made via chain structure was used to determine the via resistance (plug and contact), which was found to be 0.1 -0.3 Ω. Our technique opens a new process window for void-free high-aspect-ratio via and contact hole filling, and is particularly interesting in that it offers the potential to use aluminum or aluminum-copper in plug metallization.

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1. See, for example, a) Lai, W. Y- C., Cheung, K. P., Favreau, D. P., Case, C., Liu, R., Murray, R. G., Kwakman, L. F. Tz., and Huibregtse, D., in Proc. 8th Int. IEEE VLSI Multilevel Interconnection Conf, (Santa Clara, CA, 1991), p. 89;
b) Amazawa, T. and Arita, Y., Tech. Digest IEEE IEDM, p 265, 1991;
c) Tsubouchi, K., Masu, K., Shigeeda, N., Matano, T., Hiura, Y., and Mikoshiba, N., Appl. Phys. Lett. 57, 1221 (1990);
d) Piekaar, H., Kwakman, L., and Granneman, G. E., in Proc. 6th Int. IEEE VLSI Multilevel Interconnection Conf, (Santa Clara, CA, 1989), p. 122.
2. Tsao, J. Y. and Ehrlich, D. J., Appl. Phys. Lett 45, 617 (1984).
3. Higashi, G. S. and Fleming, C. G., Mater. Res. Soc. Symp. Proc. 75, 117 (1987).
4. Cacouris, T., Scarmozzino, R., and Osgood, R. M. Jr, in Proc. 7th Int. IEEE VLSI Multilevel Interconnection Conf, (Santa Clara, CA, 1990), p. 268.
5. Zhu, N., Cacouris, T., Scarmozzino, R., and Osgood, R. M. Jr, Appl. Phys. Lett. 58, 1180(1991).
6. Zhu, N., Cacouris, T., Scarmozzino, R., and Osgood, R. M. Jr, to be published in the J. Vac. Sci. Technol. B, May/June 1992.
7. Allen, L. H., Zhang, M. Y., Mayer, J. W., Colgan, E. G., and Young, R., J. Appl. Phys. 70, 253 (1991).

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