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Carrier dynamics around nano-scale Schottky contacts: a femtosecond near-field study

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Author

Summary, in English

We report spatially and time-resolved measurements of ultrafast carrier dynamics around buried nano-scale Schottky contacts, performed with a novel femtosecond near-field scanning optical microscope. 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. We show that the built-in field suppresses electron transport towards and trapping into the metal particles at lower optically excited carrier densities. In contrast, efficient electron trapping into the metal occurs at higher electron densities, which screen the built-in field, allowing for efficient transport of electrons towards the Schottky contact. (C) 2002 Elsevier Science B.V. All rights reserved.

Publishing year

2002

Language

English

Pages

513-516

Publication/Series

Applied Surface Science

Volume

190

Issue

1-4

Document type

Journal article

Publisher

Elsevier

Topic

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

Keywords

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

Status

Published

ISBN/ISSN/Other

  • ISSN: 1873-5584