3 research outputs found
Structural and photoluminescence properties of ZnO nanoparticles on silicon oxide
Isolated, self assembled ZnO nanoparticles are
grown in two steps: by the electron beam evaporation of Zn on
oxidised silicon wafers, during which isolated Zn nanodots are
grown, and a subsequent annealing in oxygen that results in the
desired ZnO nanodots. Low temperature PL measurements of
the ZnO nanodots show that the near band edge part of the spectra
is dominated by a zero phonon line near 3.36 eV which is an
overlap of two emitting lines near 3.363 eV and 3.367 eV. Characterization
by TEM and EELS shows that the nanoparticles are
zinc oxide single crystals grown with their c-axis perpendicular
to the substrate; their distribution, size and crystallinity depend
on the deposition parameters of zinc and the growth substrate.
We discuss the effect of these parameters on the morphology
of the resulting material. Our approach demonstrates a simple
method for the growth of high purity isolated ZnO nanodots of
similar sizes, distributed uniformly on a large surface.EU - G5RT-CT-2002-05075 SOXESS Semiconductor oxides for optoelectronics, surface acoustics and spintronic