n-Type conducting CdSe nanocrystal solids.
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 approximately 10(-2) siemens per centimeter.
Yu
Dong
D
James Franck Institute, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA.
Wang
Congjun
C
Guyot-Sionnest
Philippe
P