Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7940246 | Superlattices and Microstructures | 2017 | 15 Pages |
Abstract
Exciton binding energies for wurtzite (WZ) GaN/AlxIn1âxN quantum dots (QDs) with piezoelectric (PZ) and spontaneous (SP) polarizations were investigated by using an effective mass theory. The exciton binding energy gradually decreases with increasing Al content x in the barrier. This can be explained by the fact that the wave functions spreads into the barrier region with decreasing Al content and a higher dimensional character of the exciton is restored. The exciton binding energies for the case with PZ and SP polarizations appears to be much smaller than that for the flat-band model without the built-in field due to PZ and SP polarizations. However, their difference is observed to be negligible due to reduction in carrier confinement for the case with a relatively low Al content (x = 0.7).
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Electronic, Optical and Magnetic Materials
Authors
Seoung-Hwan Park, Woo-Pyo Hong, Jong-Jae Kim,