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Dynamics of Excitons in GaN–AlGaN MQWs with Varying Depths, Thicknesses and Barrier Widths
Author(s) -
Lefebvre P.,
Gallart M.,
Taliercio T.,
Gil B.,
Allègre J.,
Mathieu H.,
Grandjean N.,
Leroux M.,
Massies J.,
Bigenwald P.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199911)216:1<361::aid-pssb361>3.0.co;2-w
Subject(s) - picosecond , photoluminescence , exciton , quantum tunnelling , materials science , monolayer , quantum well , molecular beam epitaxy , condensed matter physics , scattering , electric field , rectangular potential barrier , molecular beam , impurity , optoelectronics , epitaxy , molecular physics , chemistry , optics , nanotechnology , physics , layer (electronics) , laser , molecule , organic chemistry , quantum mechanics
Picosecond time‐resolved photoluminescence is used to investigate the recombination dynamics of excitons in samples which all contain four GaN–Al x Ga 1— x N 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.