The luminescence of stacking faults (SFs) in m-plane ZnO epilayers grown by metal organic chemical vapor deposition is analyzed using spatially resolved cathodoluminescence (CL) spectroscopy. Complementary features observed in CL images for detection energies of 3.379 (near-bandedge) and 3.324 eV confirm the latter to be a typical SF-associated luminescence. A clear blue shift of the SF-associated luminescence is observed when the electron beam approaches the SF. This experimental result proves the existence of a polarization field in the SFs along the c-axis of the ZnO film. Furthermore, we clearly identify the SF-related transition at low temperatures and at room temperature.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)