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Cathodoluminescence study of wide band gap ZnO nanorod heterostructures.

Bernard Piechal 1Jinkyoung Yoo 2Abdel-Hamid El-Shaer 3Augustine C. Mofor 3Gyu-Chul Yi 2Andrey Bakin 3Andreas Waag 3Fabrice Donatini 1Dang Le Si 1

1. Laboratoire de Spectrométrie Physique - CNRS UMR 5588 (SPECTRO), Université J. Fourier, BP87, Saint Martin d'Hères 38402, France
2. Pohang University of Science and Technology (POSTECH), San 31, Hoyja-dong, Nam-gu, Pohang 790-784, Korea, South
3. TU Braunschweig, Institute of Semiconductor Technology (IHT), Hans Sommer Str. 66, Braunschweig 38106, Germany

Abstract

The considerable interest in nanorod structures stems from novel physics and applications opened up by their 1D character. In the case of wide band gap semiconductors, such as ZnO with record exciton binding energy of 60 meV, also high radiative quantum efficiency could be expected, which makes ZnO nanorods particularly attractive as emitters in the UV spectral range.
In this presentation we report a cathodoluminescence (CL) investigation of ZnO-based nanorods grown by MOCVD and by MBE combined with vapour phase transport. Samples are ZnO/ZnMgO quantum wells grown on top of ZnO nanorods with lengths of 1-5 µm and diameters of 50-500 nm. CL of single nanorods has been measured to probe structural and compositional properties along the nanorod axis. CL results at T = 5K and room temperature will be discussed.

This work is supported by the European Union projects HPRN-CT-2002-00298 "Photon Mediated Phenomena in Semiconductor Nanostructures", STREP FP6-016924 "Nanophotonic and Nanoelectronic Devices from Oxide Semiconductors (NANDOS)", and the Associated International Laboratory France-Korea "Center for Photonics and Nanostructures (CPN)".


CL at T = 5 K of a single ZnO nanorod at different locations 1 - 4 along the nanorod axis.

 

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Related papers

Presentation: Invited oral at E-MRS Fall Meeting 2006, Symposium F, by Dang Le Si
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-06-11 23:00
Revised:   2009-06-07 00:44