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Low-Dimensional and Nanostructured Materials and Devices pp 327–350Cite as

Optical and Structural Properties of Quantum Dots

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Part of the book series: NanoScience and Technology ((NANO))

Abstract

We report (i) thickness dependent evolution of structural disorder, strain on crystalline planes and grain size in chemical bath deposited (CBD) CdS thin films studied through a combinative evaluation of the results of optical absorption, Raman spectroscopies, X-Ray diffraction (XRD) and Scanning Electron Microscopy (SEM). (ii) refer briefly to CdSexS1-x nanocrystals in liquid and (iii) address quantum size effect in CdSexS1-x quantum dots embedded in glass studied through steady state photoluminescence spectroscopy. The asymptotic optical absorption edge is red shifted while the long wavelength tail narrows with increasing thickness which is proportional to deposition time. We employ effective mass theory under quantum size effect to estimate average grain size from the energetic position of asymptotic optical absorption edge. The long wavelength tail optical absorption is due presumably to the micro-electric field induced by crystalline defects. The transmission probability through the potential energy barrier created by micro-electric field is calculated with the help of WKB (Wentzel, Kramers, Brillouin) approximation. We conclude that as the deposition time increases from 10 to 150 min, the average grain radius changes by 2 nm, Urbach energy and the electric micro-field decrease from 600 to 400 meV and 2240–820 kV/mm respectively. The shift in XRD pattern shows that the compressive strain decreases with growth. The Raman LO1 vibrational mode display an increase up to 22 min of deposition time and then a decrease.

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Notes

  1. 1.

    Derived by using [16].

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Acknowledgements

This work has been supported by Yıldız Technical University Scientific Research Project Coordination under project nos, 2012-01-01-KAP09 and 2012-01-01-KAP03 2011-01-01-DOP01. XRD and SEM were conducted at TÜBİTAK MRS Industrial services. We thank Dr. Barış Yağcı at Surface Science and Technology Center (KUYTAM), Koç University for conducting Raman measurement.

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Authors and Affiliations

  1. Faculty of Science and Letters, Department of Physics, Yıldız Technical University, Davutpaşa Campus, Esenler, Davutpaşa Mah., Davutpaşa Caddesi, 34220, Istanbul, Turkey

    M. H. Yükselici, A. Aşıkoğlu Bozkurt, Z. Nassar & B. Can Ömür

  2. Electrical-Electronics Engineering Department, Faculty of Engineering, Toros University, 45 Evler Campus/Bahçelievler Mahallesi, 16. Street, No: 1/7 Yenisehir, 33140, Mersin, Turkey

    Ç. Allahverdi

  3. Department of Physics, İnönüMah. Kayışdağı Cad., Yeditepe University, 26 AğustosYerleşimi, 34755, Ataşehir, İstanbul, Turkey

    D. Bulut, M. K. Torun & A. T. İnce

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  1. M. H. Yükselici
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  2. A. Aşıkoğlu Bozkurt
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Correspondence to M. H. Yükselici .

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Editors and Affiliations

  1. Department of Physics Engineering, Faculty of Science and Letters,, Istanbul Technical University, Istanbul, Türkiye

    Hilmi Ünlü

  2. Department of Physics and Engineering Physics, Stevens Institute of Technology, Hoboken, NJ, USA

    Norman J. M. Horing

  3. Leibniz-Inst. für innovative Mikroelektr, Innovations for High Performance Microelectronics (IHP) GmbH, Frankfurt, Germany

    Jaroslaw Dabrowski

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Yükselici, M.H. et al. (2016). Optical and Structural Properties of Quantum Dots. In: Ünlü, H., Horing, N.J.M., Dabrowski, J. (eds) Low-Dimensional and Nanostructured Materials and Devices. NanoScience and Technology. Springer, Cham. https://doi.org/10.1007/978-3-319-25340-4_14

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