Title

Negative Differential Resistance in Electrochemically Self-assembled Layered Nanostructures

Abstract

Resonant tunneling devices are used for ultrahigh-speed applications. In this work, tunnel junctions based on copper metal (Cu) and cuprous oxide (Cu 2O) are electrochemically self-assembled from aqueous solution in an oscillating system. The Cu 2O layer thickness (L) is tuned from 0.8 to 2.8 nm by simply changing the applied current density. The layered structures show sharp negative differential resistance (NDR) signatures at room temperature in perpendicular transport measurements, and the NDR maximum shifts to higher bias with a 1/L 2 dependence as the Cu 2O layer is made thinner. The results are consistent with resonant tunneling from Cu into hole states in the valence band of quantum-confined Cu 2O through thin space - charge regions on each side of the Cu 2O.

Department(s)

Chemistry

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1999 American Chemical Society (ACS), All rights reserved.


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