Enhanced semiconductor nanocrystal conductance via solution grown contacts.
Nano Lett
; 9(11): 3676-82, 2009 Nov.
Article
em En
| MEDLINE
| ID: mdl-19691346
ABSTRACT
We report a 100000-fold increase in the conductance of individual CdSe nanorods when they are electrically contacted via direct solution phase growth of Au tips on the nanorod ends. Ensemble UV-vis and X-ray photoelectron spectroscopies indicate this enhancement does not result from alloying of the nanorod. Rather, low temperature tunneling and high temperature (250-400 K) thermionic emission across the junction at the Au contact reveal a 75% lower interface barrier to conduction compared to a control sample. We correlate this barrier lowering with the electronic structure at the Au-CdSe interface. Our results emphasize the importance of a nanocrystal surface structure for robust device performance and the advantage of this contact method.
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MEDLINE
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Ano de publicação:
2009
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Article