n -Type Conducting CdSe Nanocrystal Solids

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Abstract
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, 1S e and 1P e , increases, either by potassium or electrochemical doping. Around half-filling of the 1S e 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.