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Temperature Dependent Intermixing At The V/Ge(111) Interface

  • M. Del Giudice (a1), R. A. Butera (a1), J. J. Joyce (a1), M. W. Ruckman (a1) and J. H. Weaver (a1)...

Abstract

High resolution core level photoemission results show the temperature evolution of the V/Ge(111) interface in the range from 300 to 600 K. Three well-defined chemical environments are present for Ge at 300K (the first is the substrate and the other two are reaction products with overall shifts of−0.5 and −0.95 eV). Increasing the temperature enhances Ge outdiffusion, and a homogeneous reacted layer forms when deposition and measurements are done isothermally at 475K. The activation energy for this diffusion process is very low (5 kcal/mole), indicating the importance of grain boundary diffusion at reacting, heterogeneous interfaces.

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1. See Brillson, L.J., Surf. Sci. Rep. 2, 123 (1982)
for an extensive overview of the literature. See also Thin Films - Interdiffusion and Reactions, edited by Poate, J.M., Tu, K.N., and Mayer, J.W. (Wiley - Interscience, New York, 1978).
2. Le Lay, G., Surf. Sci. 132, 169 (1983);
Rubloff, G.W., Surf. Sci. 132, 268 (1983);
Ludeke, R., Surf. Sci. 132, 143 (1983).
3. Chambers, S.A., Howell, G.A., Greenlee, T.R., and Weaver, J.H., Phys. Rev. B31, 6402 (1985);
Weaver, J.H., chapter 2 in Analysis and Characterization of Thin Films, edited by Tu, K.N. and Rosenberg, R. (Academic Press, New York, 1986).
4. Rubloff, G.W., proceedings of this symposium, discusses medium energy ion scattering. The results are complementary to those we present here.
5. Rossi, G., Abbati, I., Braicovich, L., Lindau, I., and Spicer, W.E., J. Vac. Sci. Technol. 21, 617(1982).
6. Butera, R.A., del Giudice, M., and Weaver, J.H., Phys. Rev. B33, xxx (1986).
7. del Giudice, M., Joyce, J. J., Ruckman, M.W., and Weaver, J.H., Phys. Rev. B32, 5149 (1985).
8. del Giudice, M., Butera, R.A., Ruckman, M.W., Joyce, J. J., and Weaver, J.H., J. Vac. Sci. Technol., xxx (1986).
9. Grioni, M., Joyce, J. J., del Giudice, M., O'Neill, D.G., and Weaver, J.H., Phys. Rev. 30, 7370 (1984).
10. Weaver, J.H., Grioni, M., Joyce, J. J., and del Giudice, M., Phys. Rev. B31, 5290 (1985);
Ruckman, M.W., del Giudice, M., and Weaver, J.H., Phys. Rev. 33, xxx (1986).

Temperature Dependent Intermixing At The V/Ge(111) Interface

  • M. Del Giudice (a1), R. A. Butera (a1), J. J. Joyce (a1), M. W. Ruckman (a1) and J. H. Weaver (a1)...

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