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Optical Properties of Alloyed PbSexS1-x Nanorods

Published online by Cambridge University Press:  19 April 2012

Anna Rubin Brusilovski ,
Dikla Kolan ,
Georgy I. Maikov ,
Roman Vaxenburg ,
Aldona Sashchiuk  and
Efrat Lifshitz
Anna Rubin Brusilovski
Affiliation:
Schulich Faculty of Chemistry, Russell Berrie Nanotechnology Institute, Solid State Institute, Technion, Haifa 32000, Israel
Dikla Kolan
Affiliation:
Schulich Faculty of Chemistry, Russell Berrie Nanotechnology Institute, Solid State Institute, Technion, Haifa 32000, Israel
Georgy I. Maikov
Affiliation:
Schulich Faculty of Chemistry, Russell Berrie Nanotechnology Institute, Solid State Institute, Technion, Haifa 32000, Israel
Roman Vaxenburg
Affiliation:
Schulich Faculty of Chemistry, Russell Berrie Nanotechnology Institute, Solid State Institute, Technion, Haifa 32000, Israel
Aldona Sashchiuk
Affiliation:
Schulich Faculty of Chemistry, Russell Berrie Nanotechnology Institute, Solid State Institute, Technion, Haifa 32000, Israel
Efrat Lifshitz
Affiliation:
Schulich Faculty of Chemistry, Russell Berrie Nanotechnology Institute, Solid State Institute, Technion, Haifa 32000, Israel
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Abstract

We report the synthesis, structural and optical characterization of PbSexS1-x nanorods with diameter between 2 nm to 4.5 nm and length of 12 nm to 24 nm. Their typical photoluminescence spectra exhibit a split of the band-edge exciton band. The temperature dependence photoluminescence of these nanorods revealed a relatively small band-gap temperature coefficient and a mild extension of the radiative lifetime at cryogenic temperatures - all in comparison with photoluminescence processes in PbSe nanorods, as well as in PbSexS1-x quantum dots, with similar absorption band-edge energy. A theoretical model associates the experimental observations to the occurrence of independent transitions from either degenerate or non-degenerate band-edge valleys in PbSexS1-x nanorods, each of which possessing a relatively small electron-hole exchange interaction.

Keywords

chemical synthesiselectronic structurealloy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1390: Symposium H/I – Organic Photovoltaics–Materials to Devices , 2012 , mrsf11-1390-i04-01
Copyright
Copyright © Materials Research Society 2012

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References

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