Publication date: 27th June 2014
Photo luminescence of individual CdSe quantum nanowires
CdSe-based quantum nanowires (QNWs) are chemically synthesized using similar “TOPO” methods as for nanocrystals, but with additional Bismuth particles acting as catalysts to initiate one dimensional growth. By using this so-called solution-liquid-solid method, the diameter of the wires can be reduced to values well below the exciton dimension, while the length of the wires can exceed several micrometers. Hence, these wires can be viewed as ultra-long nanorods, where the optical properties such as the fluorescence wavelength or the absorption threshold are dictated by confinement effects in radial direction. On the other hand the photo generated charge carriers or excitons can move in length direction and can be trapped at different sites along the nanowires.Here we present a detailed structure-property relationship by combining confocal single QNW PL measurements with TEM studies on the same individual QNWs. After a brief discussion on the preparation of such QNWs we will show several results of room temperature PL in combination with EFM measurements to monitor the charge distribution upon local illumination. The main part of the talk will cover time-resolved low-temperature confocal PL spectroscopy to observe interesting features of the QNWs which are hidden at room temperature. For example we observe a manifold of spectral lines which show a blinking behavior on different time scales. The interpretation of the spectra is based on quantum mechanical models which include structure effects as well as the presence of donor and acceptor states.
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