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Strain in GaP/GaAs and GaAs/GaP resonant tunnelling heterostructures

Författare:
Publiceringsår: 2003
Språk: Engelska
Sidor: 375-379
Publikation/Tidskrift/Serie: Journal of Crystal Growth
Volym: 248
Dokumenttyp: Artikel
Förlag: Elsevier Science B.V.

Sammanfattning

We studied the morphology of GaP/(001)GaAs and GaAs/(001)GaP heterostructures grown by metal-organic vapour-phase epitaxy and found wire-like surface undulations elongated in the [110] direction. We attribute this elongation to anisotropic lateral growth rates in the [110] and [110] directions, which are due to a different roughness of monolayer surface steps. In III-V materials grown by molecular beam epitaxy. such surface corrugations are usually elongated in [110]. We explain this difference by the two growth methods having inverted ratios of lateral growth rates in [110] and [110]. Resonant tunnelling diodes fabricated from the GaP/GaAs heterostructures showed very symmetric I-V characteristics. Their peak-to-valley ratio was limited to 2. most probably due to the corrugation of the GaP barriers. (C) 2002 Elsevier Science B.V. All rights reserved.

Disputation

Nyckelord

  • Physics and Astronomy
  • resonant tunnelling diodes
  • GaP
  • GaAs
  • metalorganic vapor phase epitaxy
  • morphology
  • strain

Övriga

Published
Yes
  • ISSN: 0022-0248

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