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The effect of side-chain length on the microstructure and processing window of zone-cast naphthalene-based bispentalenes

Title data

Goetz, Katelyn P. ; Sekine, Kohei ; Paulus, Fabian ; Zhong, Yu ; Roth, Daniel ; Becker-Koch, David ; Hofstetter, Yvonne J. ; Michel, Elena ; Reichert, Lisa ; Rominger, Frank ; Rudolph, Matthias ; Hüttner, Sven ; Vaynzof, Yana ; Herzig, Eva M. ; Hashmi, A. Stephen K. ; Zaumseil, Jana:
The effect of side-chain length on the microstructure and processing window of zone-cast naphthalene-based bispentalenes.
In: Journal of Materials Chemistry C. (11 October 2019) .
ISSN 2050-7534
DOI: https://doi.org/10.1039/C9TC04470A

Abstract in another language

The solubilizing side-groups of solution-processable π-conjugated organic semiconductors affect both the crystal structure and microstructure of the respective thin films and thus charge-carrier mobility in devices. In this work, we explore how the alkyl side-chain length influences thin-film structure and charge transport in field-effect transistors of zone-cast, naphthalene-based bispentalenes. By tuning the alkyl-chain length and the casting speed, we alter the microstructure from highly aligned ribbons, to feathered ribbons, to disordered grains. Concurrently, the hole mobility changes over two orders of magnitude, from 0.001 cm2 V−1 s−1 at the fastest speeds to roughly 0.1 cm2 V−1 s−1 at slower speeds. The highest mobilities correspond to the presence of an aligned ribbon morphology. While optical measurements indicate negligible electronic differences between the molecules, grazing incidence X-ray diffraction measurements show that the films display different degrees of order and alignment. The compound with pentyl side-chains exhibits the largest tolerance to different processing conditions, yielding an aligned ribbon microstructure and high mobility over a wide range of casting speeds. Our results highlight the impact that even small changes to the molecular structure can have on the processing window and transport properties of thin-film devices.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung > Juniorprofessur Experimentalphysik VII - Dynamik und Strukturbildung - Juniorprof. Dr. Eva Maria Herzig
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Junior Professorship Solar Energy > Junior Professorship Solar Energy - Juniorprof. Dr. Sven Hüttner
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 30 Oct 2019 07:17
Last Modified: 30 Oct 2019 07:17
URI: https://eref.uni-bayreuth.de/id/eprint/52892