Sun, Ye and Ashfold, Michael N. R. (2007) Photoluminescence from diameter-selected ZnO nanorod arrays. NANOTECHNOLOGY, 18 (24).
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Arrays of ZnO nanorods with different, user-controlled, diameters were formed on Si substrates by 193 nm pulsed laser deposition in a low background pressure of oxygen. The effect of nanorod diameter on the photoluminescence exhibited by these arrays was investigated, as a function of incident ultraviolet (UV, 325 nm) laser intensity. Nanorods with large surface to volume ratios can exhibit high UV (~380 nm) emission efficiencies, particularly when excited at higher incident intensities. Pre-illumination of such nanorods with 325 nm radiation serves to enhance the UV emission measured at lower incident intensities. These observations are rationalized in terms of photo-induced desorption of surface-bound oxygen, resulting in a quenching of the depletion layer at the ZnO surface. These findings serve to reinforce the potential of ZnO nanostructures for optoelectronic device applications.
|Subjects:||Physical Science > Nanophysics|
|Deposited On:||10 Sep 2009 12:02|
|Last Modified:||10 Sep 2009 12:02|
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