Trudeau, Paul-Emile and Sheldon, Matt and Altoe, Virginia and Alivisatos, A. Paul (2008) Electrical contacts to individual colloidal semiconductor nanorods. NANO LETTERS, 8 (7). pp. 1936-1939.
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Official URL: http://pubs.acs.org/doi/abs/10.1021/nl080678t
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.
|Subjects:||Physical Science > Nano objects|
Physical Science > Nanoelectronics
|Deposited On:||06 Aug 2009 15:38|
|Last Modified:||06 Aug 2009 15:38|
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