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 journalArticlepeer-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 languageAmerican English
Pages (from-to)179-190
Number of pages12
JournalZeitschrift fur Physikalische Chemie
Volume229
Issue number1-2
DOIs
StatePublished - 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

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