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

Författare:
Publiceringsår: 2002
Språk: Engelska
Sidor: 819-822
Publikation/Tidskrift/Serie: PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
Volym: 13
Nummer: 2-4
Dokumenttyp: Artikel
Förlag: Elsevier Science

Sammanfattning

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.

Disputation

Nyckelord

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

Övrigt

Published
Yes
  • ISSN: 1386-9477

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