Kinetics of photoelectret states in Germanium-Sillenite

https://doi.org/10.1016/0022-3697(87)90089-8Get rights and content

Abstract

For a Bi12GeO20 single crystal with two liquid junctions to distilled water, transient photoelectret states were produced by optical and electrical perturbation. The transient flat band potential, observed through the transient photocurrent, is a bi-exponential function of time, with typical relaxation times of the order of 5 and 40 s. The first exponential is attributed to the equilibrium of trap charge with the internal field, the second arises from a change in driving force for this current, due to the reaction of trap charge on the quasi Fermi level. The ratio of both current contributions depends on field polarity for space variant irradiation and has a minimum at 570 nm for field polarity perturbation. The flatband potential depends in magnitude and polarity on wavelength, which is explained by two traps at 408425 and 540 nm which are charged such that their stable charge has opposite polarity, increasing and decreasing the internal electric field.

References (13)

  • Braun C. M. and Fujishima A., J. Appl. Phys....
  • Braun C. M. and Fujishima A., Jap. J. appl. Phys....
  • S.L. Hou et al.

    J. appl. Phys.

    (1971)
  • S.L. Hou et al.

    J. appl. Phys.

    (1973)
  • M. Peltier et al.

    J. appl. Phys.

    (1977)
  • V.N. Astratov et al.

    Soviet Phys. solid St.

    (1982)
There are more references available in the full text version of this article.
View full text