Abstract
Photoluminescence (PL) and stimulated emission of GaN/Si layers grown by MOVPE with AlN and AlGaN buffers have been investigated. It has been found that thermal annealing of samples in nitrogen gas flow leads to an increase of the PL efficiency of up to 20 times, with a thermal activation energy of this process of 3.1-3.4 eV. The annealing promotes a significant decrease of the non-radiative center concentration and an increase of the number of shallow states. The laser action at λ = 377 nm under pulsed optical excitation was achieved at room temperature evidencing a high quality of the samples.
| Original language | English |
|---|---|
| Pages (from-to) | 54-59 |
| Number of pages | 6 |
| Journal | Physica Status Solidi (A) Applied Research |
| Volume | 192 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jul 2002 |
| Externally published | Yes |
| Event | 4th International Symposium on Blue Lasers and Light Emitting Diodes (ISBLLED-2002) - Cordoba, Spain Duration: 11 Mar 2002 → 15 Mar 2002 |