Strong electric field and nonuniformity effects in GaN/AlN quantum dots revealed by high pressure studies

The photoluminescence (PL) from GaN quantum dots (QDs) embedded in AlN has been investigated under hydrostatic pressure. The measured pressure coefficient of emitted light energy [dE(E)/dP] shows a negative value, in contrast with the positive pressure coefficient of the GaN band gap. We also observed that increasing pressure leads to a significant decrease of the light emission intensity and an asymmetric broadening of the PL band. All these effects are related to the pressure-induced increase of the built-in electric field. A comparison is made between experimental results and the proposed theoretical model which describes the pressure behavior of nitride QDs.


Published in:
Applied Physics Letters, 89, 5, 1902
Year:
2006
ISSN:
0003-6951
Keywords:
Laboratories:




 Record created 2010-10-05, last modified 2018-03-17


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