Morphological and ferroelectric studies of Li-doped ZnO thin films

Li-doped ZnO films were grown on glass substrates by ultrasonic spray pyrolysis (pyrosol) and chemical bath deposition (CBD) methods. A comparative study was performed on the effect of Li doping (0-40at%) on the morphology and ferroelectric properties of such asgrown films. Structural investigations revealed that, in both cases, high-quality layers were grown with the wurtzite structure and c-axis preferred crystalline orientation. The surface morphology and grain structure depended on the deposition process as well as the physical properties induced by Li-doping. The temperature during the initial stage of the growth appeared as an important parameter. Ferroelectricity in Li-doped ZnO films could be observed only for the lower-temperature CBD process in which diffusion phenomena at the film/substrate interface were limited

Optical properties of ZnO nanorods and nanowires

We report continuous-wave and time-resolved optical spectroscopy of ZnO nanorods and nanowires of varying diameters grown by MOVPE, under varying thermo-dynamical conditions. We discuss the influence of these conditions on the different spectral components. Two families of photoluminescence, lines are identified. The first one is related to defect-bound excitons and to their two-electron replica. The second one is correlated to near surface states. The relative intensities of various contributions appear to be strongly dependent on the growth conditions and of the diameter of the nanostructures. Photoluminescence decay time of the different lines has been measured on one of the samples. (C) 2005 Elsevier Ltd. All rights reserved.X1112sciescopu

Optical properties of ZnO nanorods and nanowires

We report continuous-wave and time-resolved optical spectroscopy of ZnO nanorods and nanowires of varying diameters grown by MOVPE, under varying thermo-dynamical conditions. We discuss the influence of these conditions on the different spectral components. Two families of photoluminescence, lines are identified. The first one is related to defect-bound excitons and to their two-electron replica. The second one is correlated to near surface states. The relative intensities of various contributions appear to be strongly dependent on the growth conditions and of the diameter of the nanostructures. Photoluminescence decay time of the different lines has been measured on one of the samples.We acknowledge support from the French Ministry of Education, Research and Technology within the NANOZINOX Research Programs

III-V semiconductor plasmonics for microfluidic molecular sensing

International audienc

GaSb oxidation for plasmonic enhanced mid-IR molecular spectroscopy

International audienc