Articles you may be interested inStructure and optical properties of a-plane ZnO/Zn0.9Mg0.1O multiple quantum wells grown on r-plane sapphire substrates by pulsed laser deposition Erratum: "Aging effect and origin of deep-level emission in ZnO thin film deposited by pulsed laser deposition" [Appl. Phys. Lett.86, 221910 (2005)] Appl. Phys. Lett. 87, 039902 (2005); 10.1063/1.1978974 Aging effect and origin of deep-level emission in ZnO thin film deposited by pulsed laser deposition Appl. Phys. Lett. 86, 221910 (2005); 10.1063/1.1939078Er-doped ZnO thin films grown by pulsed-laser deposition

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The ultrafast carrier dynamics of epitaxial ZnO and BaTiO3 thin films after intense excitation at 3.10 eV and 4.66 eV photon energy has been studied by femtosecond absorption spectroscopy. Modelling the transient transmission changes on the basis of spectroscopic ellipsometry data and pertinent equilibrium model dielectric functions extended by additional terms for the effects at high carrier density (P-band luminescence and stimulated emission from electron-hole-plasma), a self-consistent parameterized description was obtained for both materials. Excited carrier lifetimes in the range of ≈2 to ≈60 ps and long-lived thermal effects after several hundred ps have been identified in both materials. These findings form a reliable basis to quantitatively describe future femtosecond studies on ZnO/BaTiO3 heterolayer systems.

ZrO2‐Al2O3 Bragg reflectors for future application in ZnO based resonators grown by pulsed laser deposition on c‐plane sapphire and silicon substrates show a reflectivity up to 99.8% with a layer pair number of 12.5. Layer thicknesses obtained from standard ellipsometry agree very well with thicknesses observed by transmission scanning electron microscopy. A very smooth surface roughness of Ra = 0.5 nm was observed for these Bragg reflectors. ZnO thin films grown on bulk c‐plane sapphire and on Bragg reflectors revealed comparable high photoluminescence intensity. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)