n-Type Conducting CdSe Nanocrystal Solids

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Science  23 May 2003:
Vol. 300, Issue 5623, pp. 1277-1280
DOI: 10.1126/science.1084424

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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 ∼102 siemens per centimeter.

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