Si-CdSSe core/shell nanowires with continuously tunable light emission.
Uniform Si-CdSSe core/shell nanowires were controllably synthesized by a multisource thermal evaporation route. Both the silicon core and the alloyed CdSSe shell are of high-quality and single crystalline. The silicon core is grown via the gold-catalyzed VLS route with a silicon wafer piece at the high temperature zone as the source. These preferentially grown Si nanowires further serve as templates for the afterward depositions of CdSSe shells using CdS/CdSe powders at the low temperature zone of the furnace as sources. The composition/band gap of the shells can be continuously modulated by the S/Se ratio of the evaporation sources, making these prepared heterostructures have strong and spectral position/color largely tunable light emission at the visible region. These kind of structures may have potential applications in multicolor nanoscaled light-emitting devices. This flexible growth route will also be applicable for controllable synthesis of other Si wire containing heterostructures.
Pan
An Lian
AL
MPI of Microstructure Physics, Weinberg 2, Halle 06120, Germany. pananlian@hotmail.com
Yao
Lide
L
Qin
Yong
Y
Yang
Yang
Y
Kim
Dong Sik
DS
Yu
Richeng
R
Zou
Bingsuo
B
Werner
Peter
P
Zacharias
Margit
M
Gösele
Ulrich
U