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Monolayer coverage and channel length set the mobility in self-assembled monolayer field-effect transistors
Philips Research Labs, Netherlands; Eindhoven University of Technology, Netherlands.
Philips Research Labs, Netherlands; Holst Centre TNO, Netherlands.
Philips Research Labs, Netherlands.
Philips Research Labs, Netherlands.
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2009 (English)In: Nature Nanotechnology, ISSN 1748-3387, E-ISSN 1748-3395, Vol. 4, no 10, 674-680 p.Article in journal (Refereed) Published
Abstract [en]

The mobility of self-assembled monolayer field-effect transistors (SAMFETs) traditionally decreases dramatically with increasing channel length. Recently, however, SAMFETs using liquid-crystalline molecules have been shown to have bulk-like mobilities that are virtually independent of channel length. Here, we reconcile these scaling relations by showing that the mobility in liquid crystalline SAMFETs depends exponentially on the channel length only when the monalayer is incomplete. We explain this dependence both numerically and analytically, and show that charge transport is not affected by carrier injection, grain boundaries or conducting island size. At partial coverage, that is when the monolayer is incomplete, liquid-crystalline SAMFETs thus form a unique model system to study size-dependent conductance originating from charge percolation in two dimensions.

Place, publisher, year, edition, pages
Nature Publishing Group , 2009. Vol. 4, no 10, 674-680 p.
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-141484DOI: 10.1038/nnano.2009.201ISI: 000270513900021PubMedID: 19809460OAI: oai:DiVA.org:liu-141484DiVA: diva2:1145688
Note

Funding Agencies|Dutch Technology Foundation STW; EU project ONE-P [212311]; Austrian Nanoinitiative

Available from: 2017-09-29 Created: 2017-09-29 Last updated: 2017-10-06

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