Nano Archive

Determination of band offsets in heterostructured colloidal nanorods using scanning tunneling spectroscopy

Steiner, Dov and Dorfs, Dirk and Banin, Uri and Della Sala, Fabio and Manna, Liberato and Millo, Oded (2008) Determination of band offsets in heterostructured colloidal nanorods using scanning tunneling spectroscopy. NANO LETTERS, 8 (9). pp. 2954-2958.

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The ability to tailor the properties of semiconductor nanocrystals through creating core/shell heterostructures is the cornerstone for their diverse application in nanotechnology. The band-offsets between the heterostructure components are determining parameters for their optoelectronic properties, dictating for example the degree of charge-carrier separation and localization. So far, however, no method was reported for direct measurement of these factors in colloidal nanocrystals and only indirect information could be derived from optical measurements. Here we demonstrate that scanning tunneling spectroscopy along with theoretical modeling can be used to determine band-offsets in such nanostructures. Applying this approach to CdSe/CdS quantum-dot/nanorod core/shell nanocrystals portrays its type I band structure where both the hole and electron ground state are localized in the CdSe core, in contrast to previous reports which predicted electron delocalization. The generality of the approach is further demonstrated in ZnSe/CdS nanocrystals where their type II band alignment, leading to electron-hole separation, is manifested.

Item Type:Article
Uncontrolled Keywords:semiconductor - nanocrystal - optoelectronic - STM
Subjects:Material Science > Functional and hybrid materials
Physical Science > Nanoelectronics
ID Code:6006
Deposited By:IoN
Deposited On:15 Sep 2009 10:50
Last Modified:15 Sep 2009 10:50

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