A single-electron transistor made from a cadmium selenide nanocrystal

David L. Klein, Richard Roth, Andrew K. L. Lim, A. Paul Alivisatos and Paul L. McEuen ()
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David L. Klein: University of California
Richard Roth: University of California
Andrew K. L. Lim: University of California
A. Paul Alivisatos: University of California
Paul L. McEuen: University of California

Nature, 1997, vol. 389, issue 6652, 699-701

Abstract: Abstract The techniques of colloidal chemistry permit the routine creation of semiconductor nanocrystals1,2 whose dimensions are much smaller than those that can be realized using lithographic techniques3,4,5,6. The sizes of such nanocrystals can be varied systematically to study quantum size effects or to make novel electronic or optical materials with tailored properties7,8,9. Preliminary studies of both the electrical10,11,12,13 and optical properties14,15,16 of individual nanocrystals have been performed recently. These studies show clearly that a single excess charge on a nanocrystal can markedly influence its properties. Here we present measurements of electrical transport in a single-electron transistor made from a colloidal nanocrystal of cadmium selenide. This device structure enables the number of charge carriers on the nanocrystal to be tuned directly, and so permits the measurement of the energy required for adding successive charge carriers. Such measurements are invaluable in understanding the energy-level spectra of small electronic systems, as has been shown by similar studies of lithographically patterned quantum dots3,4,5,6 and small metallic grains17.

Date: 1997
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DOI: 10.1038/39535

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