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Monolayer coverage and channel length set the mobility in self-assembled monolayer field-effect transistors

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Author: Mathijssen, S.G.J. · Smits, E.C.P. · Hal, P.A. van · Wondergem, H.J. · Ponomarenko, S.A. · Moser, A. · Resel, R. · Bobbert, P.A. · Kemerink, M. · Janssen, R.A.J. · Leeuw, D.M. de
Type:article
Date:2009
Institution: TNO Industrie en Techniek
Source:Nature Nanotechnology, 10, 4, 674-680
Identifier: 279982
doi: doi:10.1038/nnano.2009.201
Keywords: Nanotechnology · article · atomic force microscopy · controlled study · field effect transistor · liquid crystal · priority journal · self assembled monolayer field effect transistor · semiconductor · structure analysis · topography · transmission electron microscopy · X ray diffraction

Abstract

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 monolayer 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. © 2009 Macmillan Publishers Limited. All rights reserved.