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Issue 18, 2013
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Nanocrystal shape and nanojunction effects on electron transport in nanocrystal-assembled bulks

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Abstract

Bulk nanostructured materials are made from the assembly of octahedral PbSe nanocrystals. After thermal annealing, the artificial bulk demonstrates a large difference in behavior depending on the temperature, and a large variation of room-temperature resistivity of up to seven orders of magnitude. This variation originates from the high-indexed sharp edges of the octahedral nanocrystals. As the nanocrystals are arranged in the edge-to-edge configuration, which was observed in scanning electron microscopy images, the inter-nanocrystal capacitance is small due to the small parallel area between the nanocrystals. The small capacitance results in a high thermal fluctuation voltage and drives electron transport. The temperature-dependent resistivity and the electric field-dependent current are highly in agreement with the model of fluctuation-induced tunneling conduction. Thermal annealing reduces the inter-nanocrystal separation distance, creating a large variation in the electrical properties. Specifically, octahedral-shaped PbSe nanocrystals are employed in tailoring the electron transport in bulk nanostructured materials.

Graphical abstract: Nanocrystal shape and nanojunction effects on electron transport in nanocrystal-assembled bulks

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Publication details

The article was received on 22 Mar 2013, accepted on 25 Jun 2013 and first published on 29 Jul 2013


Article type: Paper
DOI: 10.1039/C3NR01418E
Citation: Nanoscale, 2013,5, 8555-8559
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    Nanocrystal shape and nanojunction effects on electron transport in nanocrystal-assembled bulks

    S. Chiu, J. Jhang, Y. Lin, S. Hsu, J. Fang and W. Jian, Nanoscale, 2013, 5, 8555
    DOI: 10.1039/C3NR01418E

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