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Lehmann H, Willing S, Möller S, et al. Coulomb blockade based field-effect transistors exploiting stripe-shaped channel geometries of self-assembled metal nanoparticles. Nanoscale. 2016;8(30):14384-92doi: 10.1039/c6nr02489k.
Lehmann, H., Willing, S., Möller, S., Volkmann, M., & Klinke, C. (2016). Coulomb blockade based field-effect transistors exploiting stripe-shaped channel geometries of self-assembled metal nanoparticles. Nanoscale, 8(30), 14384-92. https://doi.org/10.1039/c6nr02489k
Lehmann, Hauke, et al. "Coulomb blockade based field-effect transistors exploiting stripe-shaped channel geometries of self-assembled metal nanoparticles." Nanoscale vol. 8,30 (2016): 14384-92. doi: https://doi.org/10.1039/c6nr02489k
Lehmann H, Willing S, Möller S, Volkmann M, Klinke C. Coulomb blockade based field-effect transistors exploiting stripe-shaped channel geometries of self-assembled metal nanoparticles. Nanoscale. 2016 Aug 14;8(30):14384-92. doi: 10.1039/c6nr02489k. Epub 2016 May 27. PMID: 27232949.
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Nanoscale. 2016 Aug 14;8(30):14384-92. doi: 10.1039/c6nr02489k. Epub 2016 May 27.

Coulomb blockade based field-effect transistors exploiting stripe-shaped channel geometries of self-assembled metal nanoparticles.

Nanoscale

Hauke Lehmann, Svenja Willing, Sandra Möller, Mirjam Volkmann, Christian Klinke

Affiliations

  1. University of Hamburg, Institute of Physical Chemistry, Grindelallee 117, 20146 Hamburg, Germany. [email protected] [email protected].

PMID: 27232949 DOI: 10.1039/c6nr02489k

Abstract

Metallic nanoparticles offer possibilities to build basic electric devices with new functionality and improved performance. Due to the small volume and the resulting low self-capacitance, each single nanoparticle exhibits a high charging energy. Thus, a Coulomb-energy gap emerges during transport experiments that can be shifted by electric fields, allowing for charge transport whenever energy levels of neighboring particles match. Hence, the state of the device changes sequentially between conducting and non-conducting instead of just one transition from conducting to pinch-off as in semiconductors. To exploit this behavior for field-effect transistors, it is necessary to use uniform nanoparticles in ordered arrays separated by well-defined tunnel barriers. In this work, CoPt nanoparticles with a narrow size distribution are synthesized by colloidal chemistry. These particles are deposited via the scalable Langmuir-Blodgett technique as ordered, homogeneous monolayers onto Si/SiO2 substrates with pre-patterned gold electrodes. The resulting nanoparticle arrays are limited to stripes of adjustable lengths and widths. In such a defined channel with a limited number of conduction paths the current can be controlled precisely by a gate voltage. Clearly pronounced Coulomb oscillations are observed up to temperatures of 150 K. Using such systems as field-effect transistors yields unprecedented oscillating current modulations with on/off-ratios of around 70%.

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