Abstract
The heterojunction chemistry for Ge grown by molecular beam epitaxy (MBE) on in situ cleaved GaAs exhibits significant interdiffusion in short times at growth temperatures T G of 430°C (significantly lower critical T G than that reported for moderate-vacuum physical vapor deposition). This results in profound changes in the electronic properties of the interface as probed by synchrotron-radiation-excited 3d core electron photoemission. Even when there is significant alloying of the two lattice-matched semiconductors, there is nearly equal probability for Ge to bond to either a Ga or an As atom at the initial stage. As Ge becomes the dominant species, we find As preferentially diffusing toward the Ge side of the junction. This As is distributed throughout the overlayer in contrast to metal-semiconductor interface formation where the diffusing constituent resides only on the free, growing surface. We show that these behaviors are consistent with the kinetic and thermodynamic properties of the atomic species. The valence band discontinuity is negligible over atomic dimensions, while for an abrupt interface (T G = 350°C) we measure ΔE v = 0.7± 0.050.3 eV. The photoemission changes character rapidly with temperature, indicating an activation barrier for the diffusion below which simple expressions for attenuation of the photoelectrons by electron—electron scattering are applicable. In that case we deduce an escape depth of 7.0 ±0.5 Å, indicating uniform growth of Ge, with composition changing abruptly from GaAs over ~1 bond length in the (110) direction. A negligible (<0.2 eV) localized interface dipole layer is formed in the process.
Aspects of this work were performed at the Stanford Synchrotron Radiation Lab, which is supported in part by National Science Foundation Grant No. CMR 73–07602 in cooperation with the Stanford Linear Accelerator Center and U.S. Department of Energy.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
Reference
R. Z. Bachrach, R. D. Burnham, R. S. Bauer, and S. B. M. Hagstrom, Material Research Society Symposium on MBE, Cambridge, MA (1976).
J. E. Davey, Appl. Phys. Lett 8, 164 (1966).
R. W. Grant, J. R. Waldrop, and E. A. Kraut, J. Vac. Sci. Technol. 15, 2451 (1978).
A. G. Milnes and D. L. Feucht, Heterofunctions and Metal-Semconductor Junctions (Adademic, New York, 1972), p. 251.
B. L. Sharma and R. K. Purohit, Semiconductor Heterojunctions (Pergamon, New York, 1974), p. 20.
I. Ryu and K. Takahashi, Jpn. J. Appl. Phys. 4, 250 (1965).
L. P. Hunter, editor Handbook of Semiconductor Electronics (Mraw-Hill, New York, 1970) 3rd edition, p. 7–22.
H. S. Veloric and W. J Greig, R.C. A. Rev. 21, 254 (1960).
M. Kh. Karapet’yants and M. L. Karapet’yants, Thermodynamic Constants of Inorganic and Organic Compounds (Humphrey and Science Publishers, Ann Arbor, 1970), pp. 7, 99, 103.
I. Lindau, P. W. Chye, C M. Garner, P. Pianetta, C. Y. Su, and W. E. Spicer, J. Vac. Sci. Technol. 15, 2332 (1978).
R. Z. Bachrach, J. Vac. Sci. Technol. 15, 2340 (1978).
R. Z Bachrach, R. S. Bauer, and J. C. Menamin, Proc. 14th International Conference on Physics of Semiconductors (Edinburgh, 1978).
P. Pianetta, I. Lindau, C. M. Garner, and W. E. Spicer, Phys. Rev B (to be published).
J. C. Mikkelsen (private communication).
W. E. Pickett, S. G. Louis, and M L. Cohen, Phys. Rev. B17, 215 (1978).
Phys. Rev. Lett. 39, 109 (1977).
R. S. Bauer, D. J. Chadi, J. C. Mikkelsen and J. C. Menamin (to be published).
R. L. Anderson, Solid State Electron. 5, 241 (1962).
A. G. Milnes and D. L. Feucht, Ref. 3, p. 3.
R. Frensley and H. Kroemer, J. Vac. Sci. Technol. 13, 210 (1976).
J L. Shay, S. Wagner, and J. C. Phillips, Appl. Phys. Lett. 28, 21 (1976).
W. A. Harrison, J. Vac. Sci., Technol. 14, 2016 (1977).
W. E. Pickett and M. L. Cohen, J. Vac. Sci. Technol. 15, 2437 (1978).
F. Herman and R. V. Kasowski, Phys. Rev. B 17, 272 (1978).
W. E. Pickett and M. L. Cohen. Solid State Commun. 25, 225 (1978).
W. R. Frensley and H. Kroemer, Phys. Rev. B 16, 2642 (1977).
G. A. Baraff, J. A. Applebaum, and D. R. Hamann, Phys. Rev. Lett. 38, 237 (1977).
J. Vac. Sci. Technol. 14, 299 (1977).
R. S. Bauer, R. Z Bachrach, S. A. Flodstrom, and J. C. Menamin, J. Vac. Sci. Technol. 14, 278 (1977).
R. S. Bauer, D. J. Chadi, J. C. Menamin, and R. Z Bachrach, Proceedings of the 7th International Vacuum Congress and 3rd International Conference on Solid Surfaces (Vienna 1977), p. A-2699
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1988 Editoriale Jaca Book Spa, Milano
About this chapter
Cite this chapter
Bauer, R.S., McMenamin, J.C. (1988). Ge—GaAs(110) interface formation. In: Margaritondo, G. (eds) Electronic Structure of Semiconductor Heterojunctions. Perspectives in Condensed Matter Physics, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3073-5_10
Download citation
DOI: https://doi.org/10.1007/978-94-009-3073-5_10
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-277-2824-1
Online ISBN: 978-94-009-3073-5
eBook Packages: Springer Book Archive