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

article










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
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.
Topics











articleatomic force microscopycontrolled studyfield effect transistorliquid crystalpriority journalself assembled monolayer field effect transistorsemiconductorstructure analysistopographytransmission electron microscopyX ray diffraction
TNO Identifier
279982
Repository link
https://resolver.tno.nl/uuid:5a1621fc-e135-487a-97f1-7dcc95e0e068
ISSN
17483387
Source
Nature Nanotechnology, 4(10), pp. 674-680.
Pages
674-680
Files
To receive the publication files, please send an e-mail request to TNO Repository.