Dynamics of excitons in GaN-AlGaN MQWs with varying depths, thicknesses and barrier widths
Lefebvre, P.; Gallart, M.; Taliercio, T.; Gil, B.; Allegre, J.; Mathieu, H.; Grandjean, N.; Leroux, M.; Massies, J.; Bigenwald, P.
1999

Abstract

Picosecond time-resolved photoluminescence is used to investigate the recombination dynamics of excitons in samples which ail contain four GaN-AlxGa1-xN quantum wells of respective widths of 4, 8, 12 and 16 molecular monolayers, grown by molecular beam epitaxy. The compositions and thicknesses of the barriers have been varied, in order to change the electric fields induced by piezo- and pyro-electric effects. The dependences of experimental decay times with barrier characteristics indicate the presence of efficient inter-well carrier escaping. Calculations of electronic tunneling times versus barrier width show that the present carrier escaping is enhanced by some additional process, such as scattering by impurities or composition fluctuations in the barriers.

Details

Title Dynamics of excitons in GaN-AlGaN MQWs with varying depths, thicknesses and barrier widths
Author(s) Lefebvre, P. ; Gallart, M. ; Taliercio, T. ; Gil, B. ; Allegre, J. ; Mathieu, H. ; Grandjean, N. ; Leroux, M. ; Massies, J. ; Bigenwald, P.
Published in Physica Status Solidi B-Basic Research
Volume 216
Issue 1
Pages 361-364
Date 1999
ISSN 0370-1972
Keywords
DOI https://doi.org/10.1002/(SICI)1521-3951(199911)216:1<361::AID-PSSB361>3.0.CO;2-W
Laboratories LASPE
Record Appears in Scientific production and competences > SB - School of Basic Sciences > IPHYS - Institute of Physics > LASPE - Laboratory of Advanced Semiconductors for Photonics and Electronics
Peer-reviewed publications
Work outside EPFL
Journal Articles
Published
Record creation date 2010-10-05

Actions