We investigate the role of self-assembly monolayers in modulating the response of organic field-effect transistors. Alkanethiol monolayers of chain length n are self-assembled on the source and drain electrodes of pentacene field-effect transistors. The charge carrier mobility mu exhibits large fluctuations correlated with odd-even n. For n < 8, mu increases by 1 order of magnitude owing to the decrease of the hole injection barrier and the improved molecular order at the organic-metallic interface. For n >= 8, mu decays exponentially with an inverse decay length beta = 0.6 A(-1). Our results show that (i) charge injection across the interface occurs by through-bond tunneling of holes mediated by the alkanethiol layer; (ii) in the long-chain regime, the charge injection across the alkanethiol monolayer completely governs the transistor response; (iii) the transistor is a sensitive gauge for probing charge transport across single monolayers. The odd-even effect is ascribed to the anisotropic coupling between the alkanethiol terminal sigma bond and the HOMO level of ordered pentacene molecules.

Charge Injection across Self-Assembly Monolayers in Organic Field Effect Transistors: Odd-Even Effects / PABLO, STOLIAR; RAJENDRA, KSHIRSAGAR; MASSIMILIANO, MASSI; PAOLO, ANNIBALE; CRISTIANO, ALBONETTI; DAGO M., DE LEEUW; BISCARINI, FABIO. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - STAMPA. - 129:(2007), pp. 6477-6484. [10.1021/ja069235m]

Charge Injection across Self-Assembly Monolayers in Organic Field Effect Transistors: Odd-Even Effects

BISCARINI, FABIO
2007

Abstract

We investigate the role of self-assembly monolayers in modulating the response of organic field-effect transistors. Alkanethiol monolayers of chain length n are self-assembled on the source and drain electrodes of pentacene field-effect transistors. The charge carrier mobility mu exhibits large fluctuations correlated with odd-even n. For n < 8, mu increases by 1 order of magnitude owing to the decrease of the hole injection barrier and the improved molecular order at the organic-metallic interface. For n >= 8, mu decays exponentially with an inverse decay length beta = 0.6 A(-1). Our results show that (i) charge injection across the interface occurs by through-bond tunneling of holes mediated by the alkanethiol layer; (ii) in the long-chain regime, the charge injection across the alkanethiol monolayer completely governs the transistor response; (iii) the transistor is a sensitive gauge for probing charge transport across single monolayers. The odd-even effect is ascribed to the anisotropic coupling between the alkanethiol terminal sigma bond and the HOMO level of ordered pentacene molecules.
2007
129
6477
6484
Charge Injection across Self-Assembly Monolayers in Organic Field Effect Transistors: Odd-Even Effects / PABLO, STOLIAR; RAJENDRA, KSHIRSAGAR; MASSIMILIANO, MASSI; PAOLO, ANNIBALE; CRISTIANO, ALBONETTI; DAGO M., DE LEEUW; BISCARINI, FABIO. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - STAMPA. - 129:(2007), pp. 6477-6484. [10.1021/ja069235m]
PABLO, STOLIAR; RAJENDRA, KSHIRSAGAR; MASSIMILIANO, MASSI; PAOLO, ANNIBALE; CRISTIANO, ALBONETTI; DAGO M., DE LEEUW; BISCARINI, FABIO
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/963242
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