Temperature dependence of the local conductance in nanocrystalline CdSe films

D. Toker; I. Balberg; O. Zelaya-Angel; E. Savir; O. Millo

doi:10.1063/1.3607291

Temperature dependence of the local conductance in nanocrystalline CdSe films

D. Toker^*, I. Balberg, O. Zelaya-Angel, E. Savir, O. Millo

^*Corresponding author for this work

Racah Institute of Physics

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

We have studied the local transport properties of nanocrystalline CdSe films by conductance atomic force microscopy (C-AFM) in the temperature range of 25-300 K. Surprisingly, the conductance measured under positive AFM-tip bias for the more resistive films was found to increase with decreasing temperature (i.e., "metallic-like behavior"), whereas the opposite temperature dependence was observed for the more conductive samples consisting of larger crystallites. We explain the results by considering the crystallite-size dependence of quantum-confinement and electron delocalization, which accounts also for the current decay-rate under the application of negative tip-bias.

Original language	English
Article number	012102
Journal	Applied Physics Letters
Volume	99
Issue number	1
DOIs	https://doi.org/10.1063/1.3607291
State	Published - 4 Jul 2011

Bibliographical note

Funding Information:
This work was supported by the Israel Science Foundation and the Wolfson Foundation.

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AU - Balberg, I.

AU - Zelaya-Angel, O.

AU - Savir, E.

AU - Millo, O.

N1 - Funding Information: This work was supported by the Israel Science Foundation and the Wolfson Foundation.

PY - 2011/7/4

Y1 - 2011/7/4

N2 - We have studied the local transport properties of nanocrystalline CdSe films by conductance atomic force microscopy (C-AFM) in the temperature range of 25-300 K. Surprisingly, the conductance measured under positive AFM-tip bias for the more resistive films was found to increase with decreasing temperature (i.e., "metallic-like behavior"), whereas the opposite temperature dependence was observed for the more conductive samples consisting of larger crystallites. We explain the results by considering the crystallite-size dependence of quantum-confinement and electron delocalization, which accounts also for the current decay-rate under the application of negative tip-bias.

AB - We have studied the local transport properties of nanocrystalline CdSe films by conductance atomic force microscopy (C-AFM) in the temperature range of 25-300 K. Surprisingly, the conductance measured under positive AFM-tip bias for the more resistive films was found to increase with decreasing temperature (i.e., "metallic-like behavior"), whereas the opposite temperature dependence was observed for the more conductive samples consisting of larger crystallites. We explain the results by considering the crystallite-size dependence of quantum-confinement and electron delocalization, which accounts also for the current decay-rate under the application of negative tip-bias.

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Temperature dependence of the local conductance in nanocrystalline CdSe films

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