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Publicly Available Published by De Gruyter (O) November 21, 2014

Charge Transport in Cu2S Nanocrystals Arrays: Effects of Crystallite Size and Ligand Length

  • Yehonadav Bekenstein EMAIL logo , Orian Elimelech , Kathy Vinokurov , Oded Millo and Uri Banin

Abstract

Quantum confinement effects are observed in transport measurements of Cu2S nanocrystal based devices. Two nanocrystals sizes are studied, 3 nm being in the quantum-confinement regime, and 14 nm, lacking confinement. The effect of ligand length on the charge transport mechanism is studied via conductance temperature dependence measurements. While in the 14 nm nanocrystal based devices unique non-monotonic temperature dependence is observed, the 3 nm based devices show only thermally activated transport for all ligands. The difference is attributed to a cross-over from inter-particle hopping to intra-particle dominated transport as the ligand length increases. In the 3 nm devices the effect of ligand length on the charge-hopping activation energy is also discussed.


Supplementary material

the online version of this article (DOI: 10.1515/zpch-2014-0593) provides supplementary material for authorized users.


Received: 2014-8-27
Accepted: 2014-10-22
Published Online: 2014-11-21
Published in Print: 2015-2-28

©2014 Walter de Gruyter Berlin/Boston

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