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

Shao Chien Chiu, Jia Sin Jhang, Jenn-Fang Chen, Jiye Fang, Wen-Bin Jian*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

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.

Original languageEnglish
Pages (from-to)16127-16131
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume15
Issue number38
DOIs
StatePublished - 14 Oct 2013

Fingerprint Dive into the research topics of 'Effects of cross-sectional area on the tunneling-junction array in octahedral PbSe colloidal-nanocrystal solids'. Together they form a unique fingerprint.

Cite this