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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2003     Display Documents



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ID: 7465.0, MPI für Festkörperforschung / FKF Publikationen 2003
Dynamics of trapping on donors and relaxation of the B-exciton in GaN
Authors:Korona, K. P.; Wysmołek, A.; Stępniewski, R.; Potemski, M.; Kuhl, J.; Baranowski, J. M.; Martinez, G.; Grzegory, I.; Porowski, S.
Language:English
Date of Publication (YYYY-MM-DD):2003
Title of Journal:physica status solidi (b)
Volume:235
Issue / Number:1
Start Page:31
End Page:35
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:There are three exciton branches in wurzite-GaN: A, B and C.
Here, time-resolved photoluminescence and magneto-optic
spectroscopy of the B-exciton are presented, both free (FXB)
and bound to donor ((DXB)-X-0) in homoepitaxial GaN. The free
B-exciton has an energy of about 3.483 eV and a very short
lifetime of about 20 ps. The B-exciton bound to donor ((DXB)-X-
0) has an energy of 3.475 eV and a lifetime longer than the
free excitons but shorter than the lifetime of the A-exciton
bound to donor. It is shown that a simple model based on an
invariant expression describes properly the behavior of (DXA)-
X-0 and (DXB)-X-0 in a magnetic field. Results of resonance
excitation experiments suggest that in many cases the process
of binding a free exciton to a donor conserves the exciton type
and that the relaxation of B- to A-exciton takes place later.
Moreover, thermal excitation of (DXA)-X-0 to (DXB)-X-0 has been
observed.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Univ Warsaw, Inst Expt Phys, Hoza 69, PL-00681 Warsaw, Poland
; FKF, MPI, Grenoble High Magnet Field Lab, F-38042 Grenoble, France
; CNRS, F-38042 Grenoble, France
; MPI Festkorperforsch, D-70569 Stuttgart, Germany
; Polish Acad Sci, High Pressure Res Ctr, PL-01142 Warsaw, Poland
Identifiers:ISI:000180751400005
ISSN:0370-1972
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