Condensed Matter Physics Seminar

2 p.m., Thursday, November 21, 2002
Room 1201, Physics Building

 Exploring the world of CdSe nanocrystals

Marija Drndic

(Massachusetts Institute of Technology)

Abstract:  Between the world of atoms, and the world of large crystals, there is a world of nanocrystals. Nanocrystals are clusters of about a thousand atoms, a millionth of a milimeter in size, having the properties of both atoms and crystals. They can be regarded as artificial atoms whose size and composition can be tailored. Nanocrystals pack in arrays like oranges in crates to form artificial solids with new properties.  I will present the electrical transport properties and the electric-force microscopy measurements of artificial solids composed of chemically synthesized CdSe nanocrystals. Devices consist of close-packed arrays of nanocrystals, self-assembled on top of microfabricated electrodes. We can control the tunneling of electrons between nanocrystals to decrease the inter-dot separation and to lower the barrier for electron tunneling. The transport properties can also be changed by applying a gate voltage to change the electron density in the solids.  Finally, I will present experiments in which we have imaged the charge distribution in nanocrystal solids using electric-force microscopy.
Host:  Williams
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