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Direct UV patterning of electronically active fullerene films
Umeå University, Faculty of Science and Technology, Department of Physics. (The Organic Photonics and Electronics Group)
Umeå University, Faculty of Science and Technology, Department of Physics. (The Organic Photonics and Electronics Group)
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics. (The Organic Photonics and Electronics Group)
2011 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 21, no 19, 3723-3728 p.Article in journal (Refereed) Published
Abstract [en]

We utilize UV light for the attainment of high-resolution, electronically active patterns in [6,6]-phenyl C61-butyric acid methyl ester (PCBM) films. The patterns are created by directly exposing selected parts of a solution-cast PCBM film to UV light, and thereafter developing the film by immersing it in a tuned developer solution. We demonstrate that it is possible to attain complex, large-area PCBM structures with a smallest demonstrated-feature size of 1 μm by this method, and that the patterned PCBM material exhibits a high average electron mobility (1.2 × 10−2 cm2 V−1 s−1) in transistor experiments. The employment of UV light for direct patterning of PCBM for electronic applications is attractive, because PCBM exhibits high absorption in the UV range, and no sacrificial photoresist is needed. The patterning is achieved through the transformation by UV light of the soluble PCBM monomers into insoluble dimers with retained attractive electronic properties.

Place, publisher, year, edition, pages
Weinheim, Germany: Wiley-VCH Verlag GmbH , 2011. Vol. 21, no 19, 3723-3728 p.
Keyword [en]
Resist-free patterning, UV light, organic semiconductors, fullerenes, organic field-effect transistors
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:umu:diva-48545DOI: 10.1002/adfm.201100568ISI: 000295224900015OAI: oai:DiVA.org:umu-48545DiVA: diva2:450798
Available from: 2011-10-21 Created: 2011-10-21 Last updated: 2017-12-08Bibliographically approved
In thesis
1. Fabricating designed fullerene nanostructures for functional electronic devices
Open this publication in new window or tab >>Fabricating designed fullerene nanostructures for functional electronic devices
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A long-term goal within the field of organic electronics has been to developflexible and functional devices, which can be processed and patterned withlow-cost and energy-efficient solution-based methods. This thesis presents anumber of functional paths towards the attainment of this goal via thedevelopment and demonstration of novel fabrication and patterningmethods involving the important organic-semiconductor family termedfullerenes.Fullerenes are soccer-shaped small molecules, with two often-employedexamples being the symmetric C60 molecule and its more soluble derivative[6,6]-phenyl-C61-butyric acid methyl ester (PCBM). We show that PCBM canbe photochemically transformed into a dimeric state in a bi-excited reactionprocess, and that the exposed material features a significantly reducedsolubility in common solvents as well as an effectively retained electronmobility. This attractive combination of material properties allows for adirect and resist-free lithographic patterning of electronic PCBM films downto a smallest feature size of 1 µm, using a simple and scalable two-stepprocess constituting light exposure and solution development. In a furtherdevelopment, it was shown that the two-step method was useful also in thearea-selective transformation of fullerene/conjugated-polymer blend films,as demonstrated through the realization of a functional complementary logiccircuit comprising a 5-stage ring oscillator.In another project, we have synthesized highly flexible, single-crystal C60nanorods with a solution-based self-assembly process termed liquid-liquidinterfacial precipitation. The 1-dimensional nanorods can be deposited fromtheir synthesis solution and employed as the active material in field-effecttransistor devices. Here, it was revealed that the as-fabricated nanorods canfeature an impressive electron mobility of 1.0 cm2 V-1 s-1, which is on par withthe performance of a work horse in the transistor field, viz. vacuumdeposited amorphous Si. We further demonstrated that the processability ofthe nanorods can be improved by a tuned light-exposure treatment, duringwhich the nanorod shell is polymerized while the high-mobility interior bulkis left intact. This has the desired consequence that stabile nanoroddispersions can be prepared in a wide range of solvents, and we anticipatethat functional electronic devices based on solution-processable nanorodscan be realized in a near future.

Place, publisher, year, edition, pages
Umeå: Umeå universitet, 2014. 71 p.
Keyword
Organic electronics, Organic field-effect transistor, Organic photovoltaics, Fullerene C60, PCBM, Photochemical transformation, Resist-free lithography, C60 Nanorod, Solution processable
National Category
Physical Chemistry Nano Technology
Research subject
nanomaterials; Physical Chemistry; Physics; Materials Science
Identifiers
urn:nbn:se:umu:diva-97294 (URN)978-91-7601-187-4 (ISBN)
Public defence
2015-01-20, N300, Naturvetarhuset, Umeå universitet, Universitetsvägen, 901 87 Umeå, Umeå, 10:00 (English)
Opponent
Supervisors
Available from: 2014-12-19 Created: 2014-12-12 Last updated: 2014-12-18Bibliographically approved

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