Abstract
We report on the synthesis of the
Si
∕
ZnS
and
Si
∕
ZnSe
core/shell nanocrystal structures produced via a two-stage thermal evaporation of
SiO
and
ZnS
or
SiO
and
ZnSe
powder mixtures. These core/shell structures display spherical and elliptical polycrystalline particles. Most of the
Si
∕
ZnS
core/shell nanocrystal structures have diameters of
∼
90
-
160
nm
; the diameters of the cores and the thicknesses of the shells vary in a range of
∼
50
-
100
nm
. The diameters of the
Si
∕
ZnSe
core/shell nanocrystal structures range from
∼
150
to
∼
200
nm
; the thicknesses of the shells are rather uniform,
∼
30
nm
, and the diameters of the cores are thus in the range of
∼
120
-
170
nm
. Room-temperature photoluminescence was also investigated from as-synthesized
Si
/
ZnS
and
Si
/
ZnSe
core/shell nanocrystal structures, respectively.