Synthesis of type II CdTe/CdSe heterostructure tetrapod nanocrystals for PV applications

Title
Synthesis of type II CdTe/CdSe heterostructure tetrapod nanocrystals for PV applications
Authors
H. LeeS.W. Yoon안재평Y.D. SuhJ.S. LeeH. LimD. Kim
Keywords
CdTe/CdSe; Type IIheterojunction; Tetrapod nanocrystal; Band engineering; Indirect transition
Issue Date
2009-06
Publisher
Solar energy materials and solar cells : an international journal devoted to photovoltaic, photothermal, and photochemical solar energy conversion
Citation
VOL 93, NO 6-7, 779-782
Abstract
We report a facile one-pot synthetic method for the formation of CdTe/CdSe tetrapod nanocrystals with type II band alignment. The crystal growth kinetics can be controlled by changing the injection temperature, rate and concentration of the chalcogen precursor, allowing the structure of CdTe/CdSe tetrapod nanocrystals to be synthesized without changing the underlying chemistry. Only the multiple injection of Se precursor promotes epitaxial growth of a CdSe nanorod on the end of CdTe tetrapod arms. This synthesis shows that the mechanism of tetrapod nucleated growth may be generally applicable for creating other non-core/shell heterostructures. The heterostructure nanocrystals are composed of a CdTe tetrapod core and four CdSe nanorod tips, showing optical properties typical of type II heterostructures that are well suited for photovoltaic applications.
URI
http://pubs.kist.re.kr/handle/201004/37020
ISSN
0927-0248
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KIST Publication > Article
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