Article

Scanning Tunneling Luminescence of Individual CdSe Nanowires.

Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany. .
Small (impact factor: 8.35). 06/2011; DOI:10.1002/smll.201100434
Source: PubMed

ABSTRACT The local luminescence properties of individual CdSe nanowires composed of segments of zinc blende and wurtzite crystal structures are investigated by low-temperature scanning tunneling luminescence spectroscopy. Light emission from the wires is achieved by the direct injection of holes and electrons, without the need for coupling to tip-induced plasmons in the underlying metal substrate. The photon energy is found to increase with decreasing wire diameter due to exciton confinement. The bulk bandgap extrapolated from the energy versus diameter dependence is consistent with photon emission from the zinc blende-type CdSe sections.

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Keywords

decreasing wire diameter
 
direct injection
 
electrons
 
individual CdSe nanowires
 
local luminescence properties
 
low-temperature scanning tunneling luminescence spectroscopy
 
photon emission
 
photon energy
 
tip-induced plasmons
 
wires
 
wurtzite crystal structures
 
zinc blende
 
zinc blende-type CdSe sections
 

Theresa Lutz