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Science 23 May 2003:
Vol. 300. no. 5623, pp. 1277 - 1280
DOI: 10.1126/science.1084424
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Reports

n-Type Conducting CdSe Nanocrystal Solids

Dong Yu, Congjun Wang, Philippe Guyot-Sionnest*

A bottleneck limiting the widespread application of semiconductor nanocrystal solids is their poor conductivity. We report that the conductivity of thin films of n-type CdSe nanocrystals increases by many orders of magnitude as the occupation of the first two electronic shells, 1Se and 1Pe, increases, either by potassium or electrochemical doping. Around half-filling of the 1Se shell, a peak in the conductivity is observed, indicating shell-to-shell transport. Introducing conjugated ligands between nanocrystals increases the conductivities of these states to ~10–2 siemens per centimeter.

James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA.

* To whom correspondence should be addressed. E-mail: pgs{at}uchicago.edu

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