Abstract
The electronic structure of surface oxide has been investigated by measurements of internal photoemission and photoconductivity measurements for p-type single crystalline Ge specimens with real surfaces. The photo-response curves show bulk and surface effects which are separated by differential methods. Emission from the bulk into oxide states or from oxide states into the bulk result in positive or negative changes of surface conductivity. The oxide states are distributed in energy with maxima near the conduction-band edge and the valence-band edge of the oxide. Changes of the electronic structure are observed by X-irradiation and storage in laboratory air.
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References
G. C. Benson, K. S. Yun:Phase Boundary between Gases and Solids, (Mir, Moskau 1970)
V. I. Kruglov, P. P. Konorov, P. A. Poikov, N. A. Priyatkin: Sov. Phys. Sem.8, 986 (1975)
E. W. Kreutz, J. Roth: In Proc. 3rd Intern. Conf. on Thin Films, Budapest (1975) in press
E. W. Kreutz: Jap. J. Appl. Phys. Suppl.2, part 2 445 (1974)
C. B. Norris: J. Appl. Phys.43, 4060 (1972)
E. W. Kreutz: Appl. Phys.1, 161 (1973)
A. G. Revesz: IEEE Trans. ED12, 97 (1965)
W. R. Hunter, D. H. Eaton, C. T. Sah: Appl. Phys. Letters17, 211 (1970)
S. Kar, W. Dahlke: Appl. Phys. Letters18, 401 (1971)
A. F. Bogenschütz:Ätzpraxisfür Halbleiter (C. Hanser, München 1967)
E. W. Kreutz, H. Pagnia, W. Waidelich: Z. Angew. Phys.30, 145 (1970)
G. Chiarotti, S. Nanarone, R. Pastore, P. Chiaradia: Phys. Rev. B4, 3398 (1971)
L. F. Wagner, W. E. Spicer: Phys. Rev. Letters28, 1381 (1972)
E. W. Kreutz: Phys. Stat. Sol. (a)13, 557 (1972)
J. Roth: Staatsexamensarbeit, TH Darmstadt (1974)
S. M. Rywkin:Photoelektrische Erscheinungen in Halbleitern (Akademie-Verlag, Berlin 1965)
E. W. Kreutz: J. Vac. Sci. Techn.9, 871 (1972)
E. W. Kreutz, P. Schroll: Surface Sci.37, 410 (1973)
O. S. Heavens:Optical Properties of Thin Solid Films (Butter-worth, London, and Academic Press, New York 1955)
R. O. Powell: J. Appl. Phys.40, 5093 (1969)
E. W. Kreutz: Phys. Stat. Sol. (a)29, 195 (1975)
F. J. Arlinghaus, W. A. Albers: J. Phys. Chem. Sol.32, 1455 (1971)
H. Pagnia, W. Waidelich: Z. Angew. Phys.30, 150 (1970)
E. W. Kreutz: to be published
A. Frova, D. E. Aspnes: Phys. Rev.182, 795 (1969)
H. Pagnia: Phys. Stat. Sol.34, 121 (1969)
D. L. Greenaway, G. Harbeke:Optical Properties and Band Structure of Semiconductors (Pergamon Press, Oxford 1968)
D. Burst, J. C. Phillips, G. F. Bassani: Phys. Rev. Letters9, 94 (1962)
M. Cardona, F. H. Pollak: Phys. Rev.142, 530 (1966)
H. Fock: Phys. Stat. Sol. (b)56, 463 (1973)
J. R. Chelikowsky, M. L. Cohen: Phys. Rev. Letters31, 1582 (1973)
K. C. Pandey, J. C. Philipps Phys. Rev. B9, 1552 (1974)
J. C. Philipps: Sol. Stat. Phys.,18, 56 (1966)
D. E. Aspnes, J. E. Rowe: Phys. Rev. B7, 887 (1973)
R. R. Z. Zucca, Y. R. Shen: Phys. Rev. B1, 2669 (1970)
H. A. Papazian: J. Appl. Phys.,27, 1253 (1956)
G. S. Smith, P. B. Isaacs: Acta Crystallogr.17, 842 (1964)
E. W. Kreutz, H. Mödl, H. Pagnia: Z. Angew. Phys.30, 269 (1970)
M. M. Faktor, J. I. Carrasso: J. Electrochem. Soc.,112, 817 (1965)
W. A. Albers, Jr., E. W. Valyocsik, P. V. Mohan: J Electrochem. Soc.113, 196 (1966)
E. J. Johnson: InSemiconductors and Semimetals, Vol. 3 Ed. by R. K. Willardson and A. C. Beer (Academic Press, New York 1967)