Abstract
Symmetric and asymmetric quantum wells of ZnCdO structures grown on ZnO in non-polar orientations are investigated for their potential in THz emission due to the intersubband transitions between the subbands in the conduction band. The Schrödinger and Poisson equations are solved self-consistently for the square and step-barrier quantum wells of the Zn1−xCdxO layers for x up to 0.25. The results are represented as functions of the Cd concentration in the well and step-barrier layers and their dimensions. The role of the many-body effects on the intersubband transitions is discussed. It is found that emission wavelengths between 4.5 and 8.55 THz in the step-barrier quantum wells are possible in the case of an optical pumping at a wavelength in the range of 8.27–15.7 μm. The depolarization and excitonic shifts are found to contribute to the bare intersubband transition energies as much as their 15% at maximum.
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