Formation of a precursor layer in self-assembled CdTe quantum dots grown on ZnSe by molecular beam epitaxy

C. S. Yang, J. S. Wang, Y. J. Lai, C. W. Luo, D. S. Chen, Y. T. Shih, S. R. Jian, W. C. Chou

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The growth mode of CdTe quantum dots (QDs) grown on highly lattice-mismatched ZnSe buffer was investigated. CdTe QDs (0.6 to 5.0 mono-layers (MLs)) were deposited on the Se-stabilized ZnSe buffer layers using an alternating supply of Cd and Te atomic sources. Cross-sectional transmission electron microscopy and photoluminescence (PL) measurements revealed the existence of a CdSe-like two-dimensional precursor layer (PCL). The prominent difference in the temperature-dependent PL peak shift was associated with the emissions from the respective CdSe PCL and CdTe QDs. In addition, the PL excitation measurement demonstrated the existence of the first QD excited excitonic state.

Original languageEnglish
Article number385602
JournalNanotechnology
Volume18
Issue number38
DOIs
Publication statusPublished - 2007 Sep 26

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Molecular beam epitaxy
Semiconductor quantum dots
Photoluminescence
Buffer layers
Laser modes
Excited states
Buffers
Transmission electron microscopy
Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Bioengineering
  • Chemistry(all)
  • Electrical and Electronic Engineering
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Yang, C. S. ; Wang, J. S. ; Lai, Y. J. ; Luo, C. W. ; Chen, D. S. ; Shih, Y. T. ; Jian, S. R. ; Chou, W. C. / Formation of a precursor layer in self-assembled CdTe quantum dots grown on ZnSe by molecular beam epitaxy. In: Nanotechnology. 2007 ; Vol. 18, No. 38.
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Formation of a precursor layer in self-assembled CdTe quantum dots grown on ZnSe by molecular beam epitaxy. / Yang, C. S.; Wang, J. S.; Lai, Y. J.; Luo, C. W.; Chen, D. S.; Shih, Y. T.; Jian, S. R.; Chou, W. C.

In: Nanotechnology, Vol. 18, No. 38, 385602, 26.09.2007.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Formation of a precursor layer in self-assembled CdTe quantum dots grown on ZnSe by molecular beam epitaxy

AU - Yang, C. S.

AU - Wang, J. S.

AU - Lai, Y. J.

AU - Luo, C. W.

AU - Chen, D. S.

AU - Shih, Y. T.

AU - Jian, S. R.

AU - Chou, W. C.

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AB - The growth mode of CdTe quantum dots (QDs) grown on highly lattice-mismatched ZnSe buffer was investigated. CdTe QDs (0.6 to 5.0 mono-layers (MLs)) were deposited on the Se-stabilized ZnSe buffer layers using an alternating supply of Cd and Te atomic sources. Cross-sectional transmission electron microscopy and photoluminescence (PL) measurements revealed the existence of a CdSe-like two-dimensional precursor layer (PCL). The prominent difference in the temperature-dependent PL peak shift was associated with the emissions from the respective CdSe PCL and CdTe QDs. In addition, the PL excitation measurement demonstrated the existence of the first QD excited excitonic state.

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