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,$1S_e$and$1P_e$, incre...

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Veröffentlicht in:Science (American Association for the Advancement of Science) 2003-05, Vol.300 (5623), p.1277-1280
Hauptverfasser: Yu, Dong, Wang, Congjun, Guyot-Sionnest, Philippe
Format: Artikel
Sprache:eng
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Zusammenfassung: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$\sim 10^{-2}$siemens per centimeter.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.1084424