Extraction of the surface trap level from photoluminescence: a case study of ZnO nanostructures.

Negative thermal quenching of both the excitonic and green emissions is observed in ZnO nanosheets, from which the energy level of surface traps can be extracted based on a model of multi-level transitions. The present study demonstrates a non-destructive and easy method to determine the trap levels in semiconductor nanostructures. This journal is © the Owner Societies 2011