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  Dynamics of trapping on donors and relaxation of the B-exciton in GaN

Korona, K. P., Wysmołek, A., Stępniewski, R., Potemski, M., Kuhl, J., Baranowski, J. M., et al. (2003). Dynamics of trapping on donors and relaxation of the B-exciton in GaN. physica status solidi (b), 235(1), 31-35.

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 Creators:
Korona, K. P.1, Author           
Wysmołek, A.2, Author           
Stępniewski, R., Author
Potemski, M.2, Author           
Kuhl, J.1, Author           
Baranowski, J. M., Author
Martinez, G.2, Author           
Grzegory, I., Author
Porowski, S., Author
Affiliations:
1Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370501              
2High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society, ou_3371774              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 7465
ISI: 000180751400005
 Degree: -

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Title: physica status solidi (b)
Source Genre: Journal
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Pages: - Volume / Issue: 235 (1) Sequence Number: - Start / End Page: 31 - 35 Identifier: ISSN: 0370-1972