Optical properties of one- and two-dimensional excitons in m-plane ZnO/MgZnO multiple quantum wells

H. R. Chen, C. Y. Tsai, Y. C. Huang, C. C. Kuo, H. C. Hsu, W. F. Hsieh

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13 Citations (Scopus)

Abstract

Five pairs of ZnO/Zn0.9Mg0.1O multiple quantum wells (MQWs) with fixed barrier thickness of 55 nm and three well widths of 4, 8 and 16 nm have been grown on m-plane sapphires by pulsed laser deposition. Due to 2D quantum confinement with decreasing well width, the emission of excitons bound to the basal-plane stacking faults, which are one-dimensionally confined in MQWs, encounters larger blue shift than that of the near-band edge excitons. Furthermore, remarkably reducing coupling of free excitons with A 1 longitudinal optical phonons is closely correlated with increasing exciton binding energy but enhanced coupling of E 2-low phonons is a result of increasing interaction with the interface phonons with decreasing well width.

Original languageEnglish
Article number095105
JournalJournal of Physics D: Applied Physics
Volume49
Issue number9
DOIs
Publication statusPublished - 2016 Feb 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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