Preparation by molecular beam epitaxy and atomic layer molecular beam epitaxy and characterization of InAs layers 1 monolayer thick in GaAs-based structures

C. Ferrari, C. Bocchi, A. Bosacchi, S. Franchi

Research output: Contribution to journalArticle

6 Citations (Scopus)


We report a study, based on high resolution X-ray diffraction and photoluminescence (PL) measurements, of In segregation in InAs/GaAs quantum wells (QWs) 1 monolayer thick, grown by molecular beam epitaxy (MBE) and atomic layer molecular beam epitaxy (ALMBE), at different temperatures. The In content in the structures is evaluated by simulations of diffraction profiles, carried out according to the dynamical theory of X-ray diffraction. To study the segregation, we propose a new approach based on a suitable choice of the diffraction geometry. This approach allows us to deduce a value of 5.5 Å for the In segregation length in MBE structures prepared at 480 and 420 °C, and in the ALMBE structure prepared at 360 °C, while a slightly larger value (6.5 Å) is found in the ALMBE QWs grown at 460 °C. PL results on the same QWs can be interpreted in terms of a growth-temperature-dependent segregation. Our results show that the effects of segregation decrease with decreasing growth temperature and that, at a given temperature, segregation is more effective in the ALMBE structures than in the MBE counterparts.

Original languageEnglish
Pages (from-to)183-187
Number of pages5
JournalMaterials Science and Engineering B
Issue number1-3
Publication statusPublished - Dec 1994



  • Diffraction
  • Indium arsenide
  • Molecular beam epitaxy
  • Surface segregation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this