Charge transport in Cu2S nanocrystals arrays: Effects of crystallite size and ligand length

Yehonadav Bekenstein; Orian Elimelech; Kathy Vinokurov; Oded Millo; Uri Banin

doi:10.1515/zpch-2014-0593

Charge transport in Cu₂S nanocrystals arrays: Effects of crystallite size and ligand length

Yehonadav Bekenstein^*, Orian Elimelech, Kathy Vinokurov, Oded Millo, Uri Banin

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Quantum confinement effects are observed in transport measurements of Cu₂S nanocrystal based devices. Two nanocrystals sizes are studied, 3nm being in the quantum-confinement regime, and 14nm, lacking confinement. The effect of ligand length on the charge transport mechanism is studied via conductance temperature dependence measurements. While in the 14nm nanocrystal based devices unique non-monotonic temperature dependence is observed, the 3nm 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 3nm devices the effect of ligand length on the charge-hopping activation energy is also discussed.

Original language	English
Pages (from-to)	179-190
Number of pages	12
Journal	Zeitschrift fur Physikalische Chemie
Volume	229
Issue number	1-2
DOIs	https://doi.org/10.1515/zpch-2014-0593
State	Published - 28 Feb 2015

Bibliographical note

Publisher Copyright:
© 2014 Walter de Gruyter Berlin/Boston.

Keywords

Charge Transport
Copper Sulfide Nanocrystals
Ligand Exchange
Quantum Confinement
Semiconducting Nanocrystals Arrays

Access to Document

10.1515/zpch-2014-0593

Cite this

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abstract = "Quantum confinement effects are observed in transport measurements of Cu2S nanocrystal based devices. Two nanocrystals sizes are studied, 3nm being in the quantum-confinement regime, and 14nm, lacking confinement. The effect of ligand length on the charge transport mechanism is studied via conductance temperature dependence measurements. While in the 14nm nanocrystal based devices unique non-monotonic temperature dependence is observed, the 3nm 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 3nm devices the effect of ligand length on the charge-hopping activation energy is also discussed.",

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AB - Quantum confinement effects are observed in transport measurements of Cu2S nanocrystal based devices. Two nanocrystals sizes are studied, 3nm being in the quantum-confinement regime, and 14nm, lacking confinement. The effect of ligand length on the charge transport mechanism is studied via conductance temperature dependence measurements. While in the 14nm nanocrystal based devices unique non-monotonic temperature dependence is observed, the 3nm 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 3nm devices the effect of ligand length on the charge-hopping activation energy is also discussed.

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