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 anisotro...

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Published in:Nanotechnology 2010-04, Vol.21 (14), p.145602-145602
Main Authors: Kim, Yu Lee, Jung, Jae Hun, Yoon, Hyun Sik, Song, Man Suk, Bae, Se Hwan, Kim, Yong, Chen, Zhi Gang, Zou, Jin, Joyce, Hannah J, Gao, Qiang, Tan, Hark Hoe, Jagadish, Chennupati
Format: Article
Language:English
Subjects:
Cadmium selenides
Cadmium sulfides
Compact disks
Heterostructures
Intermetallics
Morphology
Nanocomposites
Nanomaterials
Nanostructure
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Summary: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.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/21/14/145602