"How many electrons make a semiconductor nanocrystal film metallic? "Boris Shklovskii , Univ. Minnesota [Host: Eugene Kolomeisky]
ABSTRACT:
Films of semiconductor nanocrystals are used as a novel, low-cost electronic materials for optoelectronic devices. To achieve their full potential a better understanding of their conductivity as a function of concentration of donors is required. So far, it is not known how many donors will make a nanocrystal film metallic. In bulk semiconductors, the critical concentration of electrons at the metal-insulator transition is universally described by the famous Mott criterion. We show theoretically that in a dense NC film, where NCs touch each other by small facets with radius r << d, the critical concentration of electrons N at the metal-insulator transition satisfies the condition is given by N r^3 = 1. |
Colloquium Friday, April 22, 2016 3:30 PM Physics Building, Room 204 Note special room. |
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