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Journal of Materials Science

, Volume 45, Issue 1, pp 112–117 | Cite as

CdSxSe1−x quantum dots studied through optical absorption, steady-state photoluminescence, and resonant Raman spectroscopies

  • B. Can Ömür
  • A. Aşıkoğlu
  • Ç. Allahverdi
  • M. H. YükseliciEmail author
Article

Abstract

CdSxSe1−x nanoparticles or quantum dots (QDs) were grown in borosilicate glass by a two-step heat-treatment process from a melt-quenched color filter glass. We incorporate the results of optical absorption, steady-state photoluminescence (PL), and resonant Raman spectroscopies in the study of growth kinetics of CdSxSe1−x QDs. A modeling of PL spectra employing two Gaussian emission bands and a quantized-state effective mass model in the strong confinement regime reveals that (i) the average particle size ranges from 1.7 to 8.5 nm, (ii) the size dispersion narrows down to 0.22 nm for a single sample, and (iii) QDs form by diffusion-limited growth. We presume that size-dependent higher energy PL band close to the asymptotic absorption edge is due to surface-assisted electron-hole recombination since the difference between optical absorption and PL bands decreases from 239 to 122 meV with increasing average radius.

Keywords

Size Dispersion Exciton Peak Exciton Band High Energy Peak Energetic Position 

Notes

Acknowledgements

This work is supported by Yıldız Technical University Research Project Coordination under project nos. 23-01-01-01 and 24-01-01-03 and partly by TUBITAK under the project no. TBAG-AY/378 (104T119). We thank M. Çulha for taking Raman spectra.

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • B. Can Ömür
    • 1
  • A. Aşıkoğlu
    • 1
  • Ç. Allahverdi
    • 1
  • M. H. Yükselici
    • 1
    Email author
  1. 1.Department of Physics, Faculty of Arts and SciencesYıldız Technical UniversityIstanbulTurkey

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