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- Transient photoluminescence of aluminum-rich (Al, Ga) N low-dimensional structures doi link

Auteur(s): Lefebvre P., Brimont C., Valvin P., Gil B., Miyake H., Hiramatsu Kazumaza

Conference: International Conference on Nitride Semiconductors – ICNS10. (Washington DC, US, 2013-08-25)
Actes de conférence: Physica Status Solidi A, vol. 211 p.765 (2014)
Texte intégral en Openaccess : istex


Ref HAL: hal-01021458_v1
DOI: 10.1002/pssa.201300505
WoS: 000333911800009
Exporter : BibTex | endNote
9 Citations
Résumé:

Light-emitting devices based on high-Al content (Al,Ga)N suffer from high densities of dislocations or other point defects, counterbalanced by the carrier localization arising from disorder in the ternary alloy. One way to improve the internal quantum efficiency is the controlled Si-doping of AlxGa1-xN/AlyGa1-yN multi-quantum wells, which was assigned to the reduction of point defects by reduction of internal strains, for some ideal concentration of Si. Time-resolved photoluminescence (TR-PL) can be used [S. F. Chichibu et al., Appl. Phys. Lett. 99, 051902 (2011)] to try and correlate the observed PL time-decays with the density of defects, in relation with the nonradiative recombination probability of photoexcited carriers. We present TR-PL studies of MOVPE-grown Si-doped AlxGa1-xN/AlyGa1-yN multi-quantum wells with typical values of x=0.6 and y=0.7 and of AlxGa1-xN epilayers with x up to 0.86. High-Al content MQWs and epilayers exhibit similar bi-exponential PL decay dynamics, with the slower component rapidly quenched when T is increased. The fast decay component remains in the nanosecond range at all temperatures and the PL intensity loss is limited by carrier localization.