C Czekalla et al 2008 Nanotechnology 19 115202 doi:10.1088/0957-4484/19/11/115202
C Czekalla1,5, J Guinard2, C Hanisch1, B Q Cao1, E M Kaidashev1, N Boukos3, A Travlos3, J Renard4, B Gayral4, D Le Si Dang2, M Lorenz1 and M Grundmann1
Show affiliationsMgZnO/ZnO quantum wells on top of ZnO nanowires were grown by pulsed laser deposition. Ensembles of spatially fluctuating and narrow cathodoluminescence peaks with single widths down to 1 meV were found at the spectral position of the quantum well emission at 4 K. In addition, the number of these narrow QW peaks increases with increasing excitation power in micro-photoluminescence, thus pointing to quantum-dot-like emission centers. Indeed, laterally strained areas of about 5 nm diameter were identified at the quantum well positions on top of the nanowires by high-resolution transmission electron microscopy.
78.60.Hk Cathodoluminescence, ionoluminescence
Condensed matter: electrical, magnetic and optical
Issue 11 (19 March 2008)
Received 5 December 2007, in final form 15 January 2008
Published 18 February 2008
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