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

M Achermann, U Siegner, Lars-Erik Wernersson, U Keller

Research output: Contribution to journalArticlepeer-review

4 Citations (SciVal)

Abstract

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.
Original languageEnglish
Pages (from-to)819-822
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume13
Issue number2-4
DOIs
Publication statusPublished - 2002

Subject classification (UKÄ)

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

Keywords

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

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