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Exciton Related Optical Properties of Zno

Exciton Related Optical Properties of Zno


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About the Book

This dissertation, "Exciton Related Optical Properties of ZnO" by Shenlei, Shi, 施申蕾, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled EXCITON RELATED OPTICAL PROPERTIES OF ZnO Submitted by SHI Shenlei for the degree of Doctor of Philosophy at The University of Hong Kong in November 2006 Exciton related optical properties, especially photoluminescence (PL) spectra of donor-bound excitons and free excitons in high-quality zinc oxide (ZnO) including nanostructures are the central issue of this research project. The longitudinal optical (LO) phonon sidebands in the excitonic PL spectra were particularly addressed. In addition, the two-electron satellites (TES) of the donor-bound excitons, the broad green emission, and second harmonic generation (SHG) in ZnO were also studied. At low temperatures, the anti-Stokes and Stokes phonon sidebands whose energy positions are non-mirror symmetric with respect to the zero phonon line were observed, giving a strong evidence for the existence of excitonic polarons. The TES transitions and their phonon replicas were also observed in the PL spectra, indicating the interplay of the excitons, donor electrons, and phonons. Interestingly, the first-order Stokes line shows a distinct Fano lineshape. Using a newly developed model based on quantum mechanics, the observed PL spectral features including the Fano lineshape can be naturally interpreted. In order to have a deep insight into the configuration interaction causing the Fano effect, excitation-power dependent PL spectra have been measured at 3.7 K. As the excitation power hence exciton density increases, evolution of the lineshape from the symmetric Lorentzian profile to the asymmetric Fano profile was clearly observed for the first-order phonon Stokes line. This shows that the interplay of the excitons, phonons and donor electrons is dependent on the exciton density. A detailed investigation on the LO phonon sidebands of the free excitons in ZnO was undertaken. It was found that the first- and second-order phonon sidebands asymmetrically broaden with temperature at different rates. The Segall-Mahan theory taking both exciton-phonon and exciton-photon coupling into account was employed to quantitatively interpret experimental spectra when only one adjustable parameter (the effective mass of heavy hole) was adopted. The study reveals the important role of the intermediate states of free excitons in determining the temperature dependence of the phonon sidebands. Influence of the anisotropic effective masses of heavy holes on the phonon sidebands was also discussed. The green emission band with fine structures was measured in ZnO at different temperatures and quantitatively reproduced using the underdamped multimode Brownian oscillator model. The results show that the two electronic transitions strongly coupled to the phonons give rise to the observed broad emission band with fine structures. The Huang-Rhys factor characterizing the electron-LO phonon coupling strength was determined. Finally, second harmonic generation (SHG) in ZnO nano-tetrapods was studied at room temperature using femtosecond near-infrared laser as the excitation light source. A strong enhancement effect of the SHG generation was observed. Analysis shows that the enhancement effect is likely due to the huge surface area of the unique tetrapods with four long legs. DOI: 10.5353/th_b3828488 Subjects: Exciton theory Photons Zinc oxide - Optical properties


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Product Details
  • ISBN-13: 9781374667181
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 124
  • Weight: 304 gr
  • ISBN-10: 1374667188
  • Publisher Date: 27 Jan 2017
  • Binding: Paperback
  • Language: English
  • Spine Width: 7 mm
  • Width: 216 mm

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