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Structural and optical properties of CdSe, CdTe and CdSeTe nanoparticles dispersed in SiO2 films

Published online by Cambridge University Press:  01 February 2011

P. Babu Dayal ,
N. V. Rama Rao ,
B. R. Mehta ,
S. M. Shivaprasad  and
P. D. Paulson
P. Babu Dayal
Affiliation:
Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi-16, India.
N. V. Rama Rao
Affiliation:
Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi-16, India.
B. R. Mehta
Affiliation:
Thin Film Laboratory, Department of Physics, Indian Institute of Technology Delhi, New Delhi-16, India.
S. M. Shivaprasad
Affiliation:
Surface Physics Group, National Physical Laboratory, New Delhi-42, India.
P. D. Paulson
Affiliation:
Institute of Energy Conversion, University of Delaware, Newark, USA.
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Abstract

CdSexTe1-x nanoparticles (with different stoichiometry ratio x) dispersed in silicon dioxide films have been grown by magnetron sputtering technique followed by thermal annealing. Effect of thermal annealing conditions on the structural, compositional, optical and electronic properties of nanoparticles has been studied using GAXRD, XPS, TEM, and spectroscopic ellipsometry techniques. A structural transformation in the nanoparticle core mediated purely by surface layer effects in the case of CdTe and a spontaneous self-organization of nanoparticles into nanorods in the case of CdSe via fractal growth has been observed. Preliminary observations from the ellipsometry measurements carried out on some of these nanoparticle films shows a blue shift of absorption edge.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 789 , 2003 , N1.8
Copyright
Copyright © Materials Research Society 2004

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