Picosecond kinetics of emission by surface excitons in ZnO
Savikhin S. F. , Freiberg A. M., Travnikov V. V.
It is shown, for the first time, that a substantial fraction of the exciton luminescence of ZnO crystals is due to excitons trapped by surface centers. It is suggested that the anomalously short lifetimes (~ 60 ps) observed for the surface excitons are a consequence of Auger processes.