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Ultrahigh Mobility in an Organic Semiconductor by Vertical Chain Alignment
Umeå University, Faculty of Science and Technology, Department of Physics.
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2016 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 28, no 12, 2359-2366 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

A method to produce highly efficient and long-range vertical charge transport is demonstrated in an undoped polythiophene thin film, with average mobilities above 3.1 cm(2) V-1 s(-1). These record high mobilities are achieved by controlled orientation of the polymer crystallites enabling the most efficient and fastest charge transport along the chain backbones and across multiple chains. The significant increase in mobility shown here may present a new route to producing faster and more efficient optoelectronic devices based on organic materials. [GRAPHICS] .

Place, publisher, year, edition, pages
2016. Vol. 28, no 12, 2359-2366 p.
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-119277DOI: 10.1002/adma.201503422ISI: 000372459600009PubMedID: 26813586OAI: oai:DiVA.org:umu-119277DiVA: diva2:932871
Available from: 2016-06-02 Created: 2016-04-15 Last updated: 2017-03-31Bibliographically approved
In thesis
1. Vertical charge transport in conjugated polymers
Open this publication in new window or tab >>Vertical charge transport in conjugated polymers
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Conjugated polymers are novel organic electronic materials highly important for organic photovoltaic applications. Charge transport is one of the key properties which defines the performance of conjugated polymers in electronic devices.

This work aims to explore the charge transport anisotropy in thin films of P3HT, one of the most common conjugated polymers. Using X-ray diffraction techniques and charge transport measurements, the relation between vertical charge transport through thin P3HT films and structure of the films was established.

It was shown that particular orientations of crystalline domains of P3HT, namely face-on and chain-on, are beneficial for vertical charge transport. These orientations provide the efficient pathways for the charges to be transported vertically, either via π-π stacking interaction between the adjacent conjugated chains, or via the conjugated chain backbones. It was also demonstrated that particular orientations of crystallites are favourable for the formation of interconnected percolated pathways providing enhanced vertical charge transport across the film.

Deposition of P3HT on most commonly used silicon substrates typically results in the formation of mostly edge-on orientation of crystallites which is unfavourable for vertical charge transport. Nanoimprint lithography was demonstrated as a powerful processing method for reorienting the edge-on crystalline domains of P3HT into chain-on (vertical) orientation. It is also shown that thin P3HT films with preferentially face-on orientations of crystallites can be deposited on graphene surface by spin coating.

Using patterning of thin P3HT films by nanoimprint lithography, unprecedentedly high average vertical mobilities in the range of 3.1-10.6 cm2 V-1 s-1 were achieved in undoped P3HT.

These results demonstrate that charge transport in thin films of a relatively simple and well-known conjugated polymer P3HT can be significantly improved using optimization of crystallinity,orientation of crystallites, polymer chain orientation and alignment in the films.

Place, publisher, year, edition, pages
Umeå: Umeå University, 2017. 88 p.
Keyword
organic electronics, conjugated polymers, nanotechnology, nanoimprint lithography, graphene, P3HT, charge transport, X-ray diffraction, structure, crystallite orientation
National Category
Nano Technology Textile, Rubber and Polymeric Materials
Research subject
Materials Science
Identifiers
urn:nbn:se:umu:diva-133180 (URN)978-91-7601-686-2 (ISBN)
Public defence
2017-05-17, N420, Naturvetarhuset, Universitetsvägen, 901 87, Umeå, 09:00 (English)
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Available from: 2017-04-26 Created: 2017-03-31 Last updated: 2017-04-24Bibliographically approved

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CiteExportLink to record
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