Semiconductor nanocrystals are a type of material with strongly size-dependent optical properties. These have been investigated extensively in particles isolate by a matrix of polymer, liquid, or glass. Current work is focussing on assembly of nanocrystals into arrays on surfaces, where they can be interrogated electrically as well as optically. Inelastic electron tunneling spectroscopy of nanocrystals of CdS, InP, and Si will be described. In addition, the construction of light emitting diodes using semiconductor nanocrystals will be presented.
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