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Issue 38, 2013
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Effects of cross-sectional area on the tunneling-junction array in octahedral PbSe colloidal-nanocrystal solids

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Abstract

Octahedral PbSe colloidal nanocrystals (NCs) are used to assemble a solid. Because of the special feature of the apexes of the octahedrons, the cross-sectional area of the inter-dot tunneling junctions is much smaller than that formed between spherical NCs. The inter-dot separation between NCs is easily adjusted by mild thermal treatment. Like a spherical NC-solid, the resistance of the octahedral NC-solid is exponentially dependent on the inter-dot separation. On the contrary, due to the difference in the cross-sectional area between the NCs, electron transport in the octahedral NC-solid does not follow the same model used for the explanation of electron transport in a spherical NC-solid. Through analyses of current–voltage and resistance–temperature behaviors, we have confirmed that the model of fluctuation-induced tunneling conduction fits very well with all of the data and explains the variation in the electrical properties of octahedral PbSe colloidal NC-solids after thermal annealing.

Graphical abstract: Effects of cross-sectional area on the tunneling-junction array in octahedral PbSe colloidal-nanocrystal solids

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Publication details

The article was received on 17 May 2013, accepted on 23 Jul 2013 and first published on 31 Jul 2013


Article type: Paper
DOI: 10.1039/C3CP52083H
Citation: Phys. Chem. Chem. Phys., 2013,15, 16127-16131
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    Effects of cross-sectional area on the tunneling-junction array in octahedral PbSe colloidal-nanocrystal solids

    S. Chiu, J. Jhang, J. Chen, J. Fang and W. Jian, Phys. Chem. Chem. Phys., 2013, 15, 16127
    DOI: 10.1039/C3CP52083H

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