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    Electrical Contacts to Individual Colloidal Semiconductor Nanorods
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    Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, and Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720
    * Corresponding author, [email protected]
    †Department of Chemistry, University of California, Berkeley.
    ‡Molecular Foundry, Lawrence Berkeley National Laboratory.
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    Nano Letters

    Cite this: Nano Lett. 2008, 8, 7, 1936–1939
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    https://doi.org/10.1021/nl080678t
    Published May 28, 2008
    Copyright © 2008 American Chemical Society
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    Abstract

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    We report the results of charge transport studies on single CdTe nanocrystals contacted via evaporated Pd electrodes. Device charging energy, Ec, monitored as a function of electrode separation drops suddenly at separations below ∼55 nm. This drop can be explained by chemical changes induced by the metal electrodes. This explanation is corroborated by ensemble X-ray photoelectron spectroscopy studies of CdTe films as well as single particle measurements by transmission electron microscopy and energy dispersive X-rays. Similar to robust optical behavior obtained when nanocrystals are coated with a protective shell, we find that a protective SiO2 layer deposited between the nanocrystal and the electrode prevents interface reactions and an associated drop in Ec,max. This observation of interface reactivity and its effect on electrical properties has important implications for the integration of nanocrystals into conventional fabrication techniques and may enable novel nanomaterials.

    Copyright © 2008 American Chemical Society

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    Additional stability diagrams and additional EDX data. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Nano Letters

    Cite this: Nano Lett. 2008, 8, 7, 1936–1939
    Click to copy citationCitation copied!
    https://doi.org/10.1021/nl080678t
    Published May 28, 2008
    Copyright © 2008 American Chemical Society
    Request reuse permissions

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