Investigation of momentum relaxation and time-dependent conductance in radiation-damaged GaAs

Journal Article (Journal Article)

We report experimental characterization of a transient capacitative electrical effect in a GaAs photoconductive switch due to initial momentum relaxation of the carriers within the photoexcited plasma. The carrier-momentum-dampening rate (d) of approximately 1 ps is characterized by optical square-pulse excitation in a radiation-damaged GaAs substrate, which produces asymmetries in the electrical impulse response of the photoconductor. Defect densities in the radiation-damaged samples are measured with use of medium-energy Rutherford backscattering and correlated with the electrical characteristics. Simulations of the electron transport and electrical response under our experimental conditions agree favorably with the observed electrical characteristics of the photoconductor. We discuss the effect of plasma dampening on electrical-switching characteristics and the site-defect capture process. © 1990 The American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Haner, M; Warren, WS

Published Date

  • January 1, 1990

Published In

Volume / Issue

  • 41 / 9

Start / End Page

  • 5792 - 5798

International Standard Serial Number (ISSN)

  • 0163-1829

Digital Object Identifier (DOI)

  • 10.1103/PhysRevB.41.5792

Citation Source

  • Scopus