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  Physics Express 2011, 1: 27
  Research Article
Optical Gain and Threshold Current Density of a P-Doped ZnO–MgZnO Quantum Dot Lasers
  Hussein B. AL-Husseini  
Nassiriya Nanotechnology Research Laboratory (NNRL), Physics Department, Science College, Thi-Qar University, Nassiriya, Iraq
  The exciton states, optical gain spectra and threshold current density of a p-doped and an undoped ZnO/MgZnO wurtzite (WZ) quantum dot QD laser are calculated. Effects of QD size and WL composition are studied It is shown that The exciton binding energy is reduced with increasing the dot size or decreasing Mg content. ZnO/Mg0.34Zn0.66O QDs are less sensitive to size fluctuations. ZnO wurtzite QD structures shown to be able for broad band laser applications. Threshold current density increases with reducing QD size. Our numerical results also studies QD size and WL composition on exciton states and optical properties of WZ ZnO/MgZnO QD.
  Quantum Dot (QD); Semiconductor Lasers; Exciton States; Optical Gain; Threshold Current Density  

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