Negative Differential Photoconductance in Gold Nanoparticle Arrays in the Coulomb Blockade Regime

Mangold, Markus A. and Calame, Michel and Mayor, Marcel and Holleitner, Alexander W.. (2012) Negative Differential Photoconductance in Gold Nanoparticle Arrays in the Coulomb Blockade Regime. ACS Nano, 6 (5). pp. 4181-4189.

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Official URL: http://edoc.unibas.ch/dok/A6031592

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We investigate the photoconductance of gold nanoparticle arrays in the Coulomb blockade regime. Two-dimensional, hexagonal crystals of nanoparticles are produced by self-assembly. The nanoparticles are weakly coupled to their neighbors by a tunneling conductance. At low temperatures, the single electron charging energy of the nanoparticles dominates the conductance properties of the array. The Coulomb blockade of the nanoparticles can be lifted by optical excitation with a laser beam. The optical excitation leads to a localized heating of the arrays, which in turn gives rise to a local change in conductance and a redistribution of the overall electrical potential in the arrays. We introduce a dual-beam optical excitation technique to probe the distribution of the electrical potential in the nanoparticle array. A negative differential photoconductance is the direct consequence of the redistribution of the electrical potential upon lifting of the Coulomb blockade. On the basis of our model, we calculate the optically induced current from the dark current–voltage characteristics of the nanoparticle array. The calculations closely reproduce the experimental observations.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Molecular Devices and Materials (Mayor)
UniBasel Contributors:Mayor, Marcel and Calame, Michel
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Chemical Society
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:05 Apr 2017 11:26
Deposited On:08 Nov 2012 16:17

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