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Ligand Control of Semiconductor Nanocrystals for Efficient Carrier Injection

Published online by Cambridge University Press:  01 February 2011

Tomohide Murase ,
Harumi Asami  and
Itaru Kamiya
Tomohide Murase
Affiliation:
Nanomaterials Laboratory, Research and Technology Development Division, Mitsubishi Chemical Group Science and Technology Research Center, Inc. 1000. Kamoshida-cho, Aoba-ku, Yokohama 227–8502, Japan
Harumi Asami
Affiliation:
Nanomaterials Laboratory, Research and Technology Development Division, Mitsubishi Chemical Group Science and Technology Research Center, Inc. 1000. Kamoshida-cho, Aoba-ku, Yokohama 227–8502, Japan
Itaru Kamiya
Affiliation:
Nanomaterials Laboratory, Research and Technology Development Division, Mitsubishi Chemical Group Science and Technology Research Center, Inc. 1000. Kamoshida-cho, Aoba-ku, Yokohama 227–8502, Japan
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Abstract

Inorganic/organic hybrid material of CdSe/ZnS core/shell nanocrystals (NCs) covered with organic ligands was prepared with ligand exchange reaction in order to facilitate carrier injection into NCs through the organic ligands. The organic ligands used in this study, 2-naphtalenethiol and bathophenanthroline, were selected as model compounds according to adjustment of highest occupied molecular orbital and lowest unoccupied molecular orbital of the ligand to valence band maximum and conduction band minimum of the CdSe NCs, respectively. The prepared hybrid NCs easily disperse in polar organic solvents such as CHCl3 and show photoluminescence only from the CdSe/ZnS core/shell NCs. Current-voltage characteristics of the ligand exchanged NCs thin films sandwiched between electrodes were investigated. It was shown that conductivity of the film was improved by the introduction of carrier injecting ligands in comparison to the ligand unexchanged trioctylphosphine oxide-capped CdSe/ZnS NC thin film.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 847: Symposium EE – Organic/Inorganic Hybrid Materials , 2004 , EE13.25
Copyright
Copyright © Materials Research Society 2005

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References

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