Breakdown of crystallinity in low-temperature-grown GaAs layers

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Zuzanna Liliental-Weber
  • W. Swider
  • J. Kortright
  • F. W. Smith
  • A. R. Calawa

Detail(s)

Original languageEnglish
Pages (from-to)2153-2155
Journal / PublicationApplied Physics Letters
Volume58
Issue number19
Publication statusPublished - 1991
Externally publishedYes

Abstract

A systematic study of the change in structural quality of as-grown GaAs layers deposited at temperatures between 180 and 210°C by molecular beam epitaxy was performed using transmission electron microscopy, double-crystal x-ray rocking curves, and particle-induced x-ray emission. We found that the crystal quality was correlated strongly with growth temperature near 200°C. The lattice parameter and the amount of As incorporated in the layer were observed to increase at lower growth temperatures. After exceeding a certain growth-temperature-dependent layer thickness, large densities of pyramidal-type defects are formed, which at lowest growth temperature result in the breakdown of crystallinity and in columnar polycrystalline growth. The lattice expansion is ascribed to the excess As in the layers. The mechanisms of breakdown of crystallinity are discussed.

Citation Format(s)

Breakdown of crystallinity in low-temperature-grown GaAs layers. / Liliental-Weber, Zuzanna; Swider, W.; Yu, K. M.; Kortright, J.; Smith, F. W.; Calawa, A. R.

In: Applied Physics Letters, Vol. 58, No. 19, 1991, p. 2153-2155.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal