Abstract
Zinc oxide (ZnO) films were grown at 600 °C on (0 0 0 1) sapphire substrates by atomic layer deposition (ALD) using diethylzinc (DEZn) and nitrous oxide (N2O) as source precursors. In some cases, low-temperature (LT) ZnO buffer layers were employed along with post-annealing or buffer-layer annealing for the optimization of ZnO growth. Based on the θ to 2θ X-ray diffraction (XRD) data, the as-grown ZnO films exhibit a preferred orientation with 〈0 0 0 1〉ZnO being parallel to the 〈0 0 0 1〉sapphire. Both post-annealing and buffer-layer annealing were found to be very helpful for improving the optical properties of the ZnO films. Room temperature (RT) photoluminescence (PL) spectra of the ZnO films show strong near-band edge (NBE) emissions with completely quenched defect luminescence. The best ZnO films were achieved with a sharp neutral donor excitonic (DoX) emission as well as phonon replicas of free A-excitons in the 10 K PL spectrum.
Original language | English |
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Pages (from-to) | 3024-3028 |
Number of pages | 5 |
Journal | Journal of Crystal Growth |
Volume | 310 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2008 Jun 1 |
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Inorganic Chemistry
- Materials Chemistry