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Issue 19, 2007
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Manipulation of charge carrier injection into organic field-effect transistors by self-assembled monolayers of alkanethiols

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Abstract

Charge carrier injection into two semiconducting polymers is investigated in field-effect transistors using gold source and drain electrodes that are modified by self-assembled monolayers of alkanethiols and perfluorinated alkanethiols. The presence of an interfacial dipole associated with the molecular monolayer at the metal/semiconductor interface changes the work function of the electrodes, and, hence, the injection of the charge carriers. The FET characteristics are analysed with the transfer line method and the hole injection into poly(2-methoxy-5-(2′-ethylhexyloxy)-1,4-phenylene vinylene) (MEH-PPV) and regio-regular poly(3-hexyl)thiophene (rr-P3HT) is investigated. The device parameters are corrected for the contact resistances of the electrodes and the mobilities of the polymers (MEH-PPV, μFET = 4 × 10−4 cm2 V−1 s−1 and rr-P3HT, μFET = (1–2) × 10−2 cm2 V−1 s−1) are determined. The contact resistance obtained for the SAM-modified electrodes is at least one order of magnitude larger than for untreated contacts.

Graphical abstract: Manipulation of charge carrier injection into organic field-effect transistors by self-assembled monolayers of alkanethiols

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Publication details

The article was received on 11 Dec 2006, accepted on 09 Feb 2007 and first published on 20 Feb 2007


Article type: Paper
DOI: 10.1039/B617995A
Citation: J. Mater. Chem., 2007,17, 1947-1953
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    Manipulation of charge carrier injection into organic field-effect transistors by self-assembled monolayers of alkanethiols

    K. Asadi, F. Gholamrezaie, E. C. P. Smits, P. W. M. Blom and B. D. Boer, J. Mater. Chem., 2007, 17, 1947
    DOI: 10.1039/B617995A

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