Abstract
The rate of second layer nucleation—the formation of a stable nucleus on top of a two-dimensional island—determines both the conditions for layer-by-layer growth, and the size of the top terrace of multilayer mounds in three-dimensional homoepitaxial growth. It was recently shown that conventional mean-field nucleation theory overestimates the rate of second layer nucleation by a factor that is proportional to the number of times a given site is visited by an adatom during its residence time on the island. In the presence of strong step-edge barriers this factor can be large, leading to a substantial error in previous attempts to experimentally determine barrier energies from the onset of second layer nucleation. In the first part of the paper simple analytic estimates of second layer nucleation rates based on a comparison of the relevant time scales will be reviewed. In the main part the theory of second layer nucleation is applied to the growth of multilayer mounds in the presence of strong but finite step-edge barriers. The shape of the mounds is obtained by numerical integration of the deterministic evolution of island boundaries, supplemented by a rule for nucleation in the top layer. For thick films the shape converges to a simple scaling solution. The scaling function is parametrized by the coverage θc of the top layer, and takes the form of an inverse error function cut off at θc. The surface width of a film of thickness d is. Finally, we show that the scaling solution can be derived also from a continuum growth equation.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Ehrlich G. and Hudda, F. (1966) Atomic view of surface diffusion: tungsten on tungsten, J. Chem. Phys. 44, pp. 1039–1099.
Schwoebel, R.L. and Shipsey, E.J. (1966) Step motion on crystal surfaces, J. Appl. Phya. 37, pp. 3682–3686.
Tersoff, J., Denier van der Gon, A.W. and Tromp, R.M. (1994) Critical island size for layer-by-layer growth, Phys. Rev. Lett. 72, pp. 266–269.
Villain, J. (1991) Continuum models of crystal-growth from atomic-beams with and without desorption, J. Phys. I (France) 1, pp. 19–42.
Thürmer, K., Koch, R., Weber, M. and Rieder, K.H. (1995) Dynamic evolution of pyramid structures during growth of epitaxial Fe (001) Films, Phys. Rev. Lett. 75, pp. 1767–1770.
Stroscio, J.A., Pierce, D.T., Stiles, M.D., Zangwill, A. and Sander, L.M. (1995) Coarsening of unstable surface features during Fe(001) homoepitaxy, Phys. Rev. Lett. 75, pp. 4246–4249.
Tsui, F., Wellman, J., Uher, C. and Clarke, R. (1996) Morphology transition and layer-by-layer growth of Rh(1111), Phys. Rev. Lett. 76, pp. 3164–3167.
Ernst, H.-J., Fabre, F., Folkerts, R. and Lapujoulade, J. (1994) Observation of a growth instability during low temperature molecular beam epitaxy, Phys. Rev. Lett. 72, pp. 112–115.
Zuo, J.-K. and Wendelken, J.F. (1997) Evolution of mound morphology in reversible homoepitaxy on Cu(100), Phys. Rev. Lett 78, pp. 2791–2794.
Kalff, M., Smilauer, P., Comsa, G. and Michely, T. (1999) No coarsening in Pt(111) homoepitaxy, Surf. Sci. 426, pp. L447–L453.
Krug, J. (1997) On the shape of wedding cakes, J. Stat. Phys. 87 (1997) pp. 505–518.
Politi, P. (1997) Different regimes in the Ehrlich-Schwoebel instability, J. Phys. I 17, pp. 797–806.
Tang, L.-H., Smilauer, P. and Vvedensky, D.D. (1998) Noise-assisted mound coarsening in epitaxial growth, Eur. Phys. J. B 2, pp. 409–412.
Siegert, M. (1998) Coarsening dynamics of crystalline thin films, Phys. Rev. Lett. 81, pp. 5481–5484.
Moldovan, D. and Golubovic, L. (2000) Interfacial coarsening dynamics in epitaxial growth with slope selection, Phys. Rev. E 61, pp. 6190–6214.
Michely, Th., Kalff, M., Comsa, G., Strobel, M. and Heinig, K.-H. (2001) Step edge diffusion and step atom detachment in surface evolution: Ion erosion of Pt(111), Phys. Rev. Lett. 86, pp. 2589–2592.
Krug, J., Politi, P. and Michely, T. (2000) Island nucleation in the presence of step-edge barriers: Theory and applications, Phys. Rev. B 61, pp. 14037–14046.
Heinrichs, S., Rottler, J. and Maass, P. (2000) Nucleation on top of islands in epitaxial growth, Phys. Rev. B 62, pp. 8338–8359.
Krug, J. (2000) Scaling regimes for second layer nucleation, Eur. Phys. J. B 18, pp. 713–719.
Castellano, C. and Politi, P. (2001) Spatiotemporal distribution of nucleation events during crystal growth, Phys. Rev. Lett. 87, 056102.
Bromann, K., Brune, H., Röder, H. and Kern, K. (1995) Interlayer mass transport in homoepitaxial and heteroepitaxial metal growth, Phys. Rev. Lett. 75, pp. 677–680.
Krug, J. (2000) Comment on “Determination of interlayer diffusion parameters for Ag(111)”, Phys. Rev. Lett. 87, art. no. 149601.
Meyer, J.A., Vrijmoeth, J., van der Vlegt, H.A., Vlieg, E. and Behm, R.J. (1995) Importance of the additional step-edge barrier in determining film morphology during epitaxial growth, Phys. Rev. B 51, pp. 14790–14793.
Krug, J. (1997) Origins of scale invariance in growth processes. Adv. Phys. 46, pp. 139–282.
Gossmann, H.-J., Sinden, F.W. and Feldman, L.C. (1990) Evolution of terrace size distributions during thin-film growth by step-mediated epitaxy, J. Appl. Phys. 67, pp. 745–752.
Cohen, P.I., Petrich, G.S., Pukite, P.R., WhaJey, G.J. and Arrott, A.S. (1989) Birth death models of epitaxy. 1. Diffraction oscillations from low index surfaces, Surf. Set. 216, pp. 222–248.
Gerlaeh, R., Maroutian, T., Douillard, L., Martinotti, D. and Ernst, H.-J. (2001) A novel method to determine the Ehrlich-Sehwoebel barrier, Surf. Sd. 480, pp. 97–102.
Michely T. Kalff M. Krug J. and Politi P. 1999 Hochzeitstorten und zipfelmutzen Strukturbildung anf platin Physikalische Blätter 55 11, pp. 53–58
Venables, J.A., Spiller, G.D.T. and Hanbücken, M. (1984) Nucleation and growth of thin films, Rep. Prog. Phys. 47, pp. 399–459.
Krug, J., Plischke M. and Siegert, M. (1993) Surface diffusion currents and the universality classes of growth, Phys. Rev. Lett. 70, pp. 3271–3274.
Politi, P., Grenet, G., Marty, A., Ponchet, A. and Villain, J. (2000) Instabilities in crystal growth by atomic or molecular beams, Phys. Rep. 324, pp. 271–404.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2002 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Krug, J., Kuhn, P. (2002). Second Layer Nucleation and the Shape of Wedding Cakes. In: Kotrla, M., Papanicolaou, N.I., Vvedensky, D.D., Wille, L.T. (eds) Atomistic Aspects of Epitaxial Growth. NATO Science Series, vol 65. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0391-9_14
Download citation
DOI: https://doi.org/10.1007/978-94-010-0391-9_14
Publisher Name: Springer, Dordrecht
Print ISBN: 978-1-4020-0675-3
Online ISBN: 978-94-010-0391-9
eBook Packages: Springer Book Archive