| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1554122 | Superlattices and Microstructures | 2012 | 8 Pages |
Undoped and Ti-doped ZnO films were deposited using radio frequency reactive magnetron sputtering at various sputtering powers. The crystal structures, surface morphology, chemical state and optical properties in Ti-doped ZnO films were systematically investigated via X-ray diffraction (XRD), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS) and ultraviolet visible (UV–Vis) spectrophotometer. Results indicated that titanium atoms may replace zinc atomic sites substitutionally or incorporate interstitially in the hexagonal lattices, and a moderate quantity of Ti atoms exist in the form of sharing the oxygen with Zn atoms and hence improve the (0 0 2) orientation. The photoluminescence (PL) spectra of the Ti-doped ZnO films contain one main blue peak, whose intensity increased with the increase of sputtering power. Our results indicated that a higher compressive stress in Ti-doped ZnO films results in a lower optical band gap and a lower transmittance, and various Ti impurities can affect the concentration of the interstitial Zn and O vacancies.
► Ti-doped ZnO films were deposited using magnetron sputtering technique. ► The crystal structures, surface morphology and optical properties were investigated. ► Ti-doped ZnO films showed a stronger preferred orientation toward c-axis. ► Optical transmission, absorption and PL of Ti-doped ZnO films was discussed. ► The intensity of blue emission peak increased with the increase of sputtering power.
