CdS/CdSe lateral heterostructure nanobelts by a two-step physical vapor transport method.
The two-dimensional heterostructure nanobelts with a central CdSe region and lateral CdS structures are synthesized by a two-step physical vapor transport method. The large growth rate difference between lateral CdS structures on both +/- (0001) sides of the CdSe region is found. The growth anisotropy is discussed in terms of the polar nature of the side +/- (0001) surfaces of CdSe. High-resolution transmission electron microscopy reveals the CdSe central region covered with non-uniform CdS layer/islands. From micro-photoluminescence measurements, a systematic blueshift of emission energy from the central CdSe region in accordance with the increase of lateral CdS growth temperature is observed. This result indicates that the intermixing rate in the CdSe region with CdS increases with the increase of lateral CdS growth temperature. In conventional CdSSe ternary nanostructures, morphology and emission wavelength were correlated parameters. However, the morphology and emission wavelength are independently controllable in the CdS/CdSe lateral heterostructure nanobelts. This structure is attractive for applications in visible optoelectronic devices.
Kim
Yu Lee
YL
Department of Physics, Dong-A University, Busan, Korea.
Jung
Jae Hun
JH
Yoon
Hyun Sik
HS
Song
Man Suk
MS
Bae
Se Hwan
SH
Kim
Yong
Y
Chen
Zhi Gang
ZG
Zou
Jin
J
Joyce
Hannah J
HJ
Gao
Qiang
Q
Tan
Hark Hoe
HH
Jagadish
Chennupati
C