Electroreflectance of Disordered Germanium Films

H. Piller; B. O. Seraphin; K. Markel; J. E. Fischer

doi:10.1103/PhysRevLett.23.775

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Electroreflectance of Disordered Germanium Films

H. Piller^*, B. O. Seraphin^†, K. Markel, and J. E. Fischer

Michelson Laboratory, China Lake, California 93555

^*Present address: Department of Physics, Louisiana State University, Baton Rouge, La. 70803.
^†Temporary address: Physics Institute I, Technical University of Denmark, 2800 Lyngby, Denmark.

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Phys. Rev. Lett. 23, 775 – Published 6 October, 1969

DOI: https://doi.org/10.1103/PhysRevLett.23.775

Abstract

The transition from the crystalline to the amorphous state has been studied in germanium thin films by observing the electroreflectance spectra related to critical points at $Γ (E_{0}, E_{0} + Δ_{0})$ , along the $Λ$ direction ( $E_{1}, E_{1} + Δ_{1}$ ), and at areas with $Δ$ and $Σ$ symmetry ( $E_{2}$ ). A small shift of $E_{0}$ to lower energy with increasing disorder in the crystalline state, and weak structure in the amorphous state, have been observed. The spectral positions of $E_{1}$ , $E_{1} + Δ_{1}$ and $E_{2}$ do not change with disorder in the crystalline state but these responses are completely absent in the amorphous state.

References (10)

N. F. Mott, Contemp. Phys. 10, 125 (1969)
F. Herman and J. P. Van Dyke, Phys. Rev. Letters 21, 1575 (1968)
J. Tauc, Science 158, 1543 (1967)
J. Stuke, Phys. Status Solidi 6, 441 (1964)
T. M. Donovan and W. E. Spicer, Phys. Rev. Letters 21, 1572 (1968)
B. O. Seraphin, in "Semiconductors and Semimetals," edited by R. K. Willardson and A. C. Beer (Academic Press, Inc., New York, to be published), Vol. VI, "Electroreflectance."
K. E. Markel, B. O. Seraphin, and H. Piller, to be published
M. Cardona, J. Appl. Phys. 32, 2151 (1961)
O. Madelung, Physics of III-V Compounds (John Wiley & Sons, Inc., New York, 1961)
T. M. Donovan, W. E. Spicer, and J. M. Bennett, Phys. Rev. Letters 22, 1058 (1969)

[c1] N. F. Mott, Contemp. Phys. 10, 125 (1969)

[c2] F. Herman and J. P. Van Dyke, Phys. Rev. Letters 21, 1575 (1968)

[c3] J. Tauc, Science 158, 1543 (1967)

[c4] J. Stuke, Phys. Status Solidi 6, 441 (1964)

[c5] T. M. Donovan and W. E. Spicer, Phys. Rev. Letters 21, 1572 (1968)

[c6] B. O. Seraphin, in "Semiconductors and Semimetals," edited by R. K. Willardson and A. C. Beer (Academic Press, Inc., New York, to be published), Vol. VI, "Electroreflectance."

[c7] K. E. Markel, B. O. Seraphin, and H. Piller, to be published

[c8] M. Cardona, J. Appl. Phys. 32, 2151 (1961)

[c9] O. Madelung, Physics of III-V Compounds (John Wiley & Sons, Inc., New York, 1961)

[c10] T. M. Donovan, W. E. Spicer, and J. M. Bennett, Phys. Rev. Letters 22, 1058 (1969)

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Electroreflectance of Disordered Germanium Films

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