Regular Article
Modulated Photocurrent Measurements on Icosahedral Cluster Solids: Boron-Rich Solids and Aluminum-Based Quasicrystals

https://doi.org/10.1006/jssc.1997.7446Get rights and content

Abstract

Modulated photocurrent measurements were performed on amorphous boron,β-rhombohedral boron, and Al–Pd–Re quasicrystal. For the quasicrystal, this is the first report on photoconductivity. The data obtained for amorphous boron are analyzed by a typical model which assumes interband photocarrier generation and trap-limited conduction. Those forβ-rhombohedral boron and the quasicrystal are analyzed by a modified model which takes account of two excitation processes for carriers: (i) photoexcitation directly to conduction (or valence) band and (ii) that to localized states followed by thermal excitation into conduction (or valence) band. The results indicate that the localized states significantly contribute to photoconduction. The existence of large densities of localized states is suggested both forβ-rhombohedral boron and quasicrystals.

References (13)

  • H. Werheit et al.

    Solid State Commun.

    (1996)
  • H. Oheda

    Solid. State. Commun.

    (1980)
  • P. Kounavis et al.

    J. Non-Cryst. Solids

    (1991)
  • A.F. Hebard et al.

    Nature

    (1991)
  • K. Kimura et al.

    Proc. 5th Int. Conf. Quasicrystals

    (1995)
  • K. Kimura et al.
There are more references available in the full text version of this article.

Cited by (4)

C. JanotR. Mosseri, Eds.

1

Research fellow of the Japan Society for Promotion of Science.

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