Charge injection across self-assembly monolayers in organic field-effect transistors: Odd-even effects
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 fluc...
| Main Authors: | , , , , , , |
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| Format: | Journal Article |
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The American Chemical Society
2007
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| Online Access: | http://hdl.handle.net/20.500.11937/11926 |
| _version_ | 1848747935457607680 |
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| author | Stoliar, P. Kshirsagar, R. Massi, Massimiliano Annibale, P. Albonetti, C. de Leeuw, D. Biscarini, F. |
| author_facet | Stoliar, P. Kshirsagar, R. Massi, Massimiliano Annibale, P. Albonetti, C. de Leeuw, D. Biscarini, F. |
| author_sort | Stoliar, P. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T06:57:03Z |
| format | Journal Article |
| id | curtin-20.500.11937-11926 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:57:03Z |
| publishDate | 2007 |
| publisher | The American Chemical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-119262017-09-13T16:09:33Z Charge injection across self-assembly monolayers in organic field-effect transistors: Odd-even effects Stoliar, P. Kshirsagar, R. Massi, Massimiliano Annibale, P. Albonetti, C. de Leeuw, D. Biscarini, F. Alkanethiol Monolayers Thin-Film Transistors Surface Gold Silicon-Oxide Contact Resistance Junctions Pentacene Electronic-Structure Molecular-Orientation 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 Journal Article http://hdl.handle.net/20.500.11937/11926 10.1021/ja069235m The American Chemical Society restricted |
| spellingShingle | Alkanethiol Monolayers Thin-Film Transistors Surface Gold Silicon-Oxide Contact Resistance Junctions Pentacene Electronic-Structure Molecular-Orientation Stoliar, P. Kshirsagar, R. Massi, Massimiliano Annibale, P. Albonetti, C. de Leeuw, D. Biscarini, F. Charge injection across self-assembly monolayers in organic field-effect transistors: Odd-even effects |
| title | Charge injection across self-assembly monolayers in organic field-effect transistors: Odd-even effects |
| title_full | Charge injection across self-assembly monolayers in organic field-effect transistors: Odd-even effects |
| title_fullStr | Charge injection across self-assembly monolayers in organic field-effect transistors: Odd-even effects |
| title_full_unstemmed | Charge injection across self-assembly monolayers in organic field-effect transistors: Odd-even effects |
| title_short | Charge injection across self-assembly monolayers in organic field-effect transistors: Odd-even effects |
| title_sort | charge injection across self-assembly monolayers in organic field-effect transistors: odd-even effects |
| topic | Alkanethiol Monolayers Thin-Film Transistors Surface Gold Silicon-Oxide Contact Resistance Junctions Pentacene Electronic-Structure Molecular-Orientation |
| url | http://hdl.handle.net/20.500.11937/11926 |