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Nano-scale Schottky contacts: ultrafast drift-diffusion dynamics studied in the optical near field

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Author

Summary, in English

We present direct measurements of the ultrafast carrier dynamics around buried nano-scale Schottky contacts with high spatial and time resolution, performed with a novel fermosecond near-field scanning optical microscope, It is shown that high optically excited carrier densities screen the built-in field around a Schottky contact and allow for efficient transport of electrons towards the contact, followed by trapping of electrons into the metal. The experimental results are modeled by a self-consistent treatment of the drift-diffusion equation for the carriers and Poisson's equation for the built-in electric field. (C) 2002 Elsevier Science B.V. All rights reserved.

Publishing year

2002

Language

English

Pages

819-822

Publication/Series

Physica E: Low-Dimensional Systems and Nanostructures

Volume

13

Issue

2-4

Document type

Journal article

Publisher

Elsevier

Topic

  • Condensed Matter Physics
  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • ultrafast carrier transport
  • Schottky nano-contacts
  • near-field optics
  • W-GaAs

Status

Published

ISBN/ISSN/Other

  • ISSN: 1386-9477