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Field Effect and Photoconduction in Au25 Nanoclusters Films

Michael Galchenko, Andrés Black, Leonard Heymann, Christian Klinke Orcid Logo

Advanced Materials, Volume: 31, Issue: 18, Start page: 1900684

Swansea University Author: Christian Klinke Orcid Logo

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DOI (Published version): 10.1002/adma.201900684

Abstract

Quantum confined Au nanoclusters exhibit molecule-like properties, including atomic precision and discrete energy levels. The electrical conductivity of Au nanocluster films can vary by several orders of magnitude, and is determined by the strength of the electronic coupling between the individual n...

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Published in: Advanced Materials
ISSN: 0935-9648 1521-4095
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50213
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Abstract: Quantum confined Au nanoclusters exhibit molecule-like properties, including atomic precision and discrete energy levels. The electrical conductivity of Au nanocluster films can vary by several orders of magnitude, and is determined by the strength of the electronic coupling between the individual nanoclusters in the film. Similar to quantum confined, semiconducting quantum dots, the electrical coupling in films is dependent on the size and structure of the Au core and the length and conjugation of the organic ligands surrounding it. Unlike quantum dots, however, semiconducting transport has not been reported in Au nanocluster films. We demonstrate that through a simple yet careful choice of cluster size and organic ligands, stable Au nanocluster films can electronically couple and become semiconducting, exhibiting electric field effect and photoconductivity. The molecule-like nature of the Au nanoclusters is evidenced by a hopping transport mechanism reminiscent of doped, disordered organic semiconductor films. These results demonstrate the potential of metal nanoclusters as a solution processed material for semiconducting devices.
College: Faculty of Science and Engineering
Issue: 18
Start Page: 1900684