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Lead Sulphide Quantum-Sized Particles With Absorption Band Onset in the Near Infra Red

Published online by Cambridge University Press:  10 February 2011

J.C. Bhat ,
T. Krishnakumar ,
R.R. Nayak ,
O.V. Salata ,
J.L. Hutchison  and
P.J. Dobson
J.C. Bhat
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ.
T. Krishnakumar
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ.
R.R. Nayak
Affiliation:
Department of Materials Science, University of Oxford, Parks Road, Oxford, OX1 3PH.
O.V. Salata
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ.
J.L. Hutchison
Affiliation:
Department of Materials Science, University of Oxford, Parks Road, Oxford, OX1 3PH.
P.J. Dobson
Affiliation:
Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ.
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Abstract

Lead sulphide nanoparticles were prepared by colloidal techniques and subsequently deposited onto glass slides as uniform, dry films. In so doing, the effective bandgap of the semiconductor was increased from that of the bulk material by the quantum size effect. By varying the growth conditions, it was possible to change the mean particle size from 3nm to 7nm. This size variation was accompanied by (i) a variation in the absorption band onset of the material from 0.7μm to 1.3μm and (ii) a change in its colour from red to greyish-brown. No excitonic features were observed. TEM showed that the shape of the particles, as well as their size, was dependent on the growth conditions. Cubic and rod-like particles were grown in aqueous solution. Spherical particles preferable for optoelectronic devices were grown in methanolic/aqueous and aqueous solutions. However, these spherical particles were not as reproducible as the cubic ones.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 421: Symposium D – Compound Semiconductor Electronics and Photonics , 1996 , 145
Copyright
Copyright © Materials Research Society 1996

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