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.; Martinez, G.; Grzegory, I.; Porowski, S.

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

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Korona, K. P.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Wysmołek, A.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Potemski, M.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Kuhl, J.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Martinez, G.
High Magnetic Field Laboratory, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-000E-F947-A

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.