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Nanocrystals acting as Coulomb islands operating at room temperature created using a focused ion-beam process

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7 Author(s)
Kim, T.W. ; Department of Physics, Kwangwoon University, 447-1 Wolgye-dong, Nowon-ku, Seoul 139-701, Korea ; Choo, D.C. ; Shim, J.H. ; Jung, M.
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A Ga+ focused ion-beam (FIB) technique utilizing both lithographic and nanoparticle formation processes has been introduced to create nanocrystals acting as Coulomb islands at room temperature. High-resolution transmission electron microscopy results show that the nanocrystals acting as Coulomb islands are created in the source-drain active layer by using a Ga+ FIB. The results for the drain current and the conductance as functions of the drain voltage with an open gate voltage at room temperature show a Coulomb staircase and conductance oscillations, respectively. Nanoscale particles of Al with an amorphous phase are created in the source-drain channel by the defects due to the radiation effect of the Ga+ FIB, and collisions between Ga+ ions and Al atoms produce secondary electrons, that interact with the nanoparticles, which are acting as Coulomb islands, to form the crystal phase. © 2001 American Institute of Physics.

Published in:

Applied Physics Letters  (Volume:79 ,  Issue: 1 )

Date of Publication:

Jul 2001

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