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Effects of rapid thermal annealing on self-assembled InGaAs/GaAs quantum dots superlattice

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • Qiandong Zhuang
  • J. M. Li
  • X. X. Wang
  • Y. P. Zeng
  • Y. T. Wang
  • B. Q. Wang
  • L. Pan
  • J. Wu
  • M.Y. Kong
  • L. Y. Lin
<mark>Journal publication date</mark>2000
<mark>Journal</mark>Journal of Crystal Growth
Issue number1-4
Number of pages4
Pages (from-to)791-794
Publication StatusPublished
<mark>Original language</mark>English


Postgrowth rapid thermal annealing was used to study the relaxation mechanism and optical properties of InGaAs/GaAs self-assembled quantum dots superlattice grown by molecular beam epitaxy. It is found that a significant narrowing of the luminescence linewidth (from 80 to 42 meV) occurs together with about 86 meV blue shift at annealing temperature up to 950°C. Double crystal X-ray diffraction measurements show that the intensity of the satellite diffraction peak, which corresponds to the quantum dots superlattice, decreased with the increasing annealing temperature and disappeared at 750°C, but recovered and increased again at higher annealing temperatures. This behavior can be explained by two competing relaxation mechanisms; interdiffusion and favored migration. The study indicates that a suitable annealing treatment can improve the structural properties of the quantum dots superlattice.