Impact ionization of excitons in an electric field in GaN

Quenching of the exciton luminescence of GaN epitaxial films and GaN/AlGaN quantum wells in an electric field is observed and attributed to impact ionization of excitonic states by hot electrons. It is found that impurity scattering rules the momentum relaxation of electrons rather than the acoustic phonon scattering. The effective mean free path of hot electrons l(eff) is estimated. The value of l(eff) for quantum wells appears to be one order of magnitude larger than that for epitaxial films.


Published in:
Physica Status Solidi B-Basic Solid State Physics, 216, 1, 63-67
Year:
1999
ISSN:
0370-1972
Laboratories:




 Record created 2010-10-05, last modified 2018-03-17


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