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Facet-selective growth and optical properties of CdTe/CdSe tetrapod-shaped nanocrystal heterostructures

Published online by Cambridge University Press:  12 July 2011

Roman B. Vasiliev ,
Dmitry N. Dirin ,
Maria S. Sokolikova ,
Vladimir V. Roddatis ,
Alexander L. Vasiliev ,
Alexei G. Vitukhnovsky  and
Alexander M. Gaskov
Roman B. Vasiliev*
Affiliation:
Department of Materials Science, Moscow State University, Leninskie Gory, Moscow 119991, Russia
Dmitry N. Dirin
Affiliation:
Department of Materials Science, Moscow State University, Leninskie Gory, Moscow 119991, Russia
Maria S. Sokolikova
Affiliation:
Department of Materials Science, Moscow State University, Leninskie Gory, Moscow 119991, Russia
Vladimir V. Roddatis
Affiliation:
Russian Research Centre “Kurchatov Institute,” Moscow 123182, Russia
Alexander L. Vasiliev
Affiliation:
Russian Research Centre “Kurchatov Institute,” Moscow 123182, Russia
Alexei G. Vitukhnovsky
Affiliation:
Department of Luminescence, Lebedev Physical Institute, Moscow 119991, Russia
Alexander M. Gaskov
Affiliation:
Department of Chemistry, Moscow State University, Leninskie Gory, Moscow 119991, Russia
*
a)Address all correspondence to this author. e-mail: romvas@inorg.chem.msu.ru
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Abstract

Selective CdSe tip growth on CdTe tetrapod-shaped colloidal seeds has been achieved for a Cd:surfactant molar ratio of 1:2, where surfactant is oleic acid. The average length of tetrapod arms increased from 12 to 21 nm while arm width remained constant of 3 nm. Formation of CdSe tips shifts the excitonic absorption maximum to the near-infrared region and the appearance of low-intensity absorption feature corresponding to a charge-transfer band. At the same time, luminescence band splits into a narrow (about 100 meV width) CdTe excitonic subband and a 230-meV-wide charge-transfer subband, with splitting energy increasing up to 260 meV depending on CdSe tip length. The intensity ratio of charge transfer to excitonic luminescence increases exponentially with splitting energy rise. Considerable modification of the photoluminescence spectrum has been observed with temperature variation in the range of 10–60 °C.

Keywords

NanostructureCore/shellOptical properties
Type
Articles
Information
Journal of Materials Research , Volume 26 , Issue 13 , 14 July 2011 , pp. 1621 - 1626
Copyright
Copyright © Materials Research Society 2011

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