A micro-photoluminescence study of vertically stacked InGaAs-GaAs double-layer quantum dots

Young Chul Choi, Tae Geun Kim, Young Min Park, Young Ju Park

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The optical properties of In 0.5Ga 0.5As-GaAs single-layer quantum dots (SL-QDs) and three vertically stacked double-layer quantum dots (DL-QDs) with different spacer thicknesses, grown by solid-source molecular beam epitaxy (MBE) in Stranski-Krastonow (S-K) growth mode, are investigated by micro-photoluminescence (μ-PL) spectroscopy. Interestingly, μ-PL spectra of all DL-QDs are observed at energies lower by approximately 40 meV, compared with those of SL-QDs, indicating the effective coupling of DL-QDs, along with multiple sub-peaks on the right shoulder of the luminescence center. A reduction in overall energies of the quantum dot (QD) in terms of electronic coupling, and the creation of multiple energy states in terms of mutual interactions among the DL-QDs of different sizes and shapes, are considered to be possible reasons for this phenomenon. The excitation-power- dependent μ-PL spectra also show state-filling effects in the lowest energy levels of the DL-QDs.

Original languageEnglish
Pages (from-to)134-137
Number of pages4
JournalJournal of the Korean Physical Society
Issue number1
Publication statusPublished - 2004 Jul
Externally publishedYes


  • Micro-photoluminescence
  • Molecular beam epitaxy
  • Quantum dot

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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