Optical properties of in situ annealed InAs/GaAs quantum dots

Authors

  • Jennette Mateo National Institute of Physics, University of the Philippines Diliman
  • Elmer Estacio National Institute of Physics, University of the Philippines Diliman
  • Armando Somintac National Institute of Physics, University of the Philippines Diliman
  • Arnita Podpod National Institute of Physics, University of the Philippines Diliman
  • Marie Josephine De Luna National Institute of Physics, University of the Philippines Diliman
  • Arnel Salvador National Institute of Physics, University of the Philippines Diliman

Abstract

This work investigates the effect of in situ annealing on the size distribution of MBE-grown InAs/GaAs quantum dots (QDs) by photoluminescence (PL) measurements. In situ annealed QDs exhibit two distinct PL peaks as compared to that of the unannealed QDs, exhibiting only one peak. The annealed sample has a peak at smaller wavelength (blue-shifted) and with narrower FWHM suggesting higher degree of uniformity in size. The blue-shift is attributed to more dominant increase in Ga content of the QDs through In/Ga interdiffusion, which occurs during annealing. Thus, annealing increases the size of QDs, but more dominantly, also increases the Ga content producing a blue-shift in PL spectrum. The increase in dot size and In/Ga interdiffusion were further verified by Raman spectroscopy.

SPP 2003 Proceedings Cover

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Published

2003-10-22

Issue

2003: Proceedings of the 21st Samahang Pisika ng Pilipinas Physics Congress

Section

Optics and Photonics

License

By submitting their manuscript to the Samahang Pisika ng Pilipinas (SPP) for consideration, the Authors warrant that their work is original, does not infringe on existing copyrights, and is not under active consideration for publication elsewhere.
Upon acceptance of their manuscript, the Authors further agree to grant SPP the non-exclusive, worldwide, and royalty-free rights to record, edit, copy, reproduce, publish, distribute, and use all or part of the manuscript for any purpose, in any media now existing or developed in the future, either individually or as part of a collection.
All other associated economic and moral rights as granted by the Intellectual Property Code of the Philippines are maintained by the Authors.

How to Cite

[1]
“Optical properties of in situ annealed InAs/GaAs quantum dots”, Proc. SPP, vol. 21, no. 1, pp. SPP–2003, Oct. 2003, Accessed: Mar. 25, 2026. [Online]. Available: https://proceedings.spp-online.org/article/view/SPP-2003-2C-02