Subpicosecond carrier transport in GaAs surface-space-charge fields

Dekorsy, Thomas; Pfeifer, Torsten; Kütt, Waldemar; Kurz, Heinrich

Subpicosecond carrier transport in GaAs surface-space-charge fields

Files

Subpicosecond_carrier_transport_in_GaAs_surface_space_charge_fields.pdf(1.22 MB)

Date

1993

Authors

Dekorsy, Thomas

Pfeifer, Torsten

Kütt, Waldemar

Kurz, Heinrich

Publication type

Journal article

Published in

Physical Review B ; 47 (1993), 7. - pp. 3842-3849

Abstract

Above-band-gap pulsed optical excitation of electron-hole pairs within the surface-space-charge region of semiconductors alters the surface-space-charge field via free-carrier transport. We report on the direct observation of this ultrafast transient screening and the associated charge-carrier transport by applying reflective electro-optic sampling (REOS) with subpicosecond time resolution to (100)-oriented GaAs surfaces. The REOS measurements performed under different initial surface field conditions and various optical excitation densities are compared to numerical simulations of hot-carrier transport, including the calculation of the optical response. The simulations, which are based on a simple drift-diffusion model for optically excited electron-hole pairs, are in quantitative agreement with the experiment. The strength and sign of the static built-in field can be determined and the carrier drift velocities can be derived on a subpicosecond time scale.

Subject (DDC)

530 Physics

Cite This

ISO 690

DEKORSY, Thomas, Torsten PFEIFER, Waldemar KÜTT, Heinrich KURZ, 1993. Subpicosecond carrier transport in GaAs surface-space-charge fields. In: Physical Review B. 47(7), pp. 3842-3849. Available under: doi: 10.1103/PhysRevB.47.3842

BibTex

@article{Dekorsy1993Subpi-5299,
  year={1993},
  doi={10.1103/PhysRevB.47.3842},
  title={Subpicosecond carrier transport in GaAs surface-space-charge fields},
  number={7},
  volume={47},
  journal={Physical Review B},
  pages={3842--3849},
  author={Dekorsy, Thomas and Pfeifer, Torsten and Kütt, Waldemar and Kurz, Heinrich}
}

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