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Growth of large crystalline grains of vanadyl-phthalocyanine without epitaxy on graphene
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Marsden, Alexander J., Rochford, Luke A., Wood, Dawn, Ramadan, Alexandra J., Laker, Zachary P. L., Jones, T. S. and Wilson, Neil R. (2016) Growth of large crystalline grains of vanadyl-phthalocyanine without epitaxy on graphene. Advanced Functional Materials, 26 (8). pp. 1188-1196. doi:10.1002/adfm.201503594
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Official URL: http://dx.doi.org/10.1002/adfm.201503594
Abstract
The performance of organic semiconductor thin films in electronic devices is related to their crystal structure and morphology, with charge transport mobility dependent on the degree of crystallinity and on the crystallographic orientation. Here organic molecular beam deposition of vanadyl phthalocyanine is studied on graphene and it is shown that crystalline grains up to several micrometers across can be formed at substrate temperatures of 155 °C, compared to room temperature grain sizes of ≈30 nm. Transmission electron microscopy confirms the presence of long range order at elevated substrate temperatures and reveals that the molecules are stacked in an edge-on orientation, but are not epitaxially aligned to the graphene. The crystalline grain sizes are significantly larger on graphene than on disordered substrates such as graphene oxide and silicon oxide. The effect on charge transport is probed by conducting atomic force microscopy, with the high temperature films on graphene showing increased mobility and uniformity and decreased trap density. These results illustrate an important advantage for the integration of graphene electrodes with organic semiconductor devices: the homogeneous surface of graphene results in high diffusion and low nucleation rates for thin film growth, encouraging the formation of highly crystalline films even with nonepitaxial growth.
| Item Type: | Journal Article | ||||||||
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| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering | ||||||||
| Divisions: | Faculty of Science > Chemistry Faculty of Science > Physics |
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| Library of Congress Subject Headings (LCSH): | Electronic apparatus and appliances, Organic semiconductors, Phthalocyanines, Graphene | ||||||||
| Journal or Publication Title: | Advanced Functional Materials | ||||||||
| Publisher: | Wiley-Blackwell Publishing Ltd. | ||||||||
| ISSN: | 1616-301X | ||||||||
| Official Date: | 23 February 2016 | ||||||||
| Dates: |
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| Volume: | 26 | ||||||||
| Number: | 8 | ||||||||
| Page Range: | pp. 1188-1196 | ||||||||
| DOI: | 10.1002/adfm.201503594 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access | ||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), European Regional Development Fund (ERDF), Advantage West Midlands (AWM) | ||||||||
| Grant number: | EP/K503204/1 (EPSRC), EP/G037515 (EPSRC), | ||||||||
| Adapted As: |
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