Transport properties of annealed CdSe nanocrystal solids

Details Transport properties of annealed CdSe nanocrystal solids Transport properties of annealed CdSe nanocrystal solids

2002-04-29

arxiv.org/abs/cond-mat/0204614v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

24 pages,4 figures, 1 table

Scientific paper

10.1063/1.1523148

Transport properties of artificial solids composed of colloidal CdSe nanocrystals (NCs) are studied from 6 K to 250 K, before and after annealing. Annealing results in greatly enhanced dark and photocurrent in NC solids, while transmission electron microscopy (TEM) micrographs show that the inter-dot separation decreases. The increased current can be attributed to the enhancement of inter-dot tunneling caused by the decreased separation between NCs and by chemical changes in their organic cap. In addition, the absorption spectra of annealed solids are slightly red-shifted and broadened. These red-shifts may result from the change of the dielectric environment around the NCs. Our measurements also indicate that Coulomb interactions between charges on neighboring NCs play an important role in the tunneling current.

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