Title: Nanocrystal shape and nanojunction effects on electron transport in nanocrystal-assembled bulks
Authors: Chiu, Shao-Chien
Jhang, Jia-Sin
Lin, Yen-Fu
Hsu, Shih-Ying
Fang, Jiye
Jian, Wen-Bin
Department of Electrophysics
Issue Date: 2013
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.
URI: http://hdl.handle.net/11536/22624
ISSN: 2040-3364
DOI: 10.1039/c3nr01418e
Volume: 5
Issue: 18
Begin Page: 8555
End Page: 8559
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