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Article

Charge Carrier Mobility Improvement in Diketopyrrolopyrrole Block-Copolymers by Shear Coating

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Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, 01069 Dresden, Germany
2
Faculty of Chemistry and Food Chemistry, Technische Universität Dresden, 01062 Dresden, Germany
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Center for Advancing Electronics Dresden, Faculty of Electrical and Computer Engineering, Technische Universität Dresden, Helmholtzstraße 18, 01069 Dresden, Germany
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Leibniz Institute for Solid State and Materials Research, Helmholtzstraße 20, 01069 Dresden, Germany
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Martin-Luther-Universität Halle-Wittenberg, Naturwissenschaftliche Fakultät II, Von-Danckelmann-Platz 4, 06120 Halle, Germany
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Institute of Organic Chemistry and Macromolecular Chemistry, Friedrich Schiller University Jena, Humboldtstr 10, 07743 Jena, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Jacek Ulanski
Polymers 2021, 13(9), 1435; https://doi.org/10.3390/polym13091435
Received: 30 March 2021 / Revised: 23 April 2021 / Accepted: 24 April 2021 / Published: 29 April 2021
Shear coating is a promising deposition method for upscaling device fabrication and enabling high throughput, and is furthermore suitable for translating to roll-to-roll processing. Although common polymer semiconductors (PSCs) are solution processible, they are still prone to mechanical failure upon stretching, limiting applications in e.g., electronic skin and health monitoring. Progress made towards mechanically compliant PSCs, e.g., the incorporation of soft segments into the polymer backbone, could not only allow such applications, but also benefit advanced fabrication methods, like roll-to-roll printing on flexible substrates, to produce the targeted devices. Tri-block copolymers (TBCs), consisting of an inner rigid semiconducting poly-diketo-pyrrolopyrrole-thienothiophene (PDPP-TT) block flanked by two soft elastomeric poly(dimethylsiloxane) (PDMS) chains, maintain good charge transport properties, while being mechanically soft and flexible. Potentially aiming at the fabrication of TBC-based wearable electronics by means of cost-efficient and scalable deposition methods (e.g., blade-coating), a tolerance of the electrical performance of the TBCs to the shear speed was investigated. Herein, we demonstrate that such TBCs can be deposited at high shear speeds (film formation up to a speed of 10 mm s−1). While such high speeds result in increased film thickness, no degradation of the electrical performance was observed, as was frequently reported for polymer−based OFETs. Instead, high shear speeds even led to a small improvement in the electrical performance: mobility increased from 0.06 cm2 V−1 s−1 at 0.5 mm s−1 to 0.16 cm2 V−1 s−1 at 7 mm s−1 for the TBC with 24 wt% PDMS, and for the TBC containing 37 wt% PDMS from 0.05 cm2 V−1 s−1 at 0.5 mm s−1 to 0.13 cm2 V−1 s−1 at 7 mm s−1. Interestingly, the improvement of mobility is not accompanied by any significant changes in morphology. View Full-Text
Keywords: block copolymers; organic field-effect transistors; shear coating; shear speed; thickness-dependent mobility block copolymers; organic field-effect transistors; shear coating; shear speed; thickness-dependent mobility
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MDPI and ACS Style

Ditte, K.; Kiriy, N.; Perez, J.; Hambsch, M.; Mannsfeld, S.C.B.; Krupskaya, Y.; Maragani, R.; Voit, B.; Lissel, F. Charge Carrier Mobility Improvement in Diketopyrrolopyrrole Block-Copolymers by Shear Coating. Polymers 2021, 13, 1435. https://doi.org/10.3390/polym13091435

AMA Style

Ditte K, Kiriy N, Perez J, Hambsch M, Mannsfeld SCB, Krupskaya Y, Maragani R, Voit B, Lissel F. Charge Carrier Mobility Improvement in Diketopyrrolopyrrole Block-Copolymers by Shear Coating. Polymers. 2021; 13(9):1435. https://doi.org/10.3390/polym13091435

Chicago/Turabian Style

Ditte, Kristina, Nataliya Kiriy, Jonathan Perez, Mike Hambsch, Stefan C.B. Mannsfeld, Yulia Krupskaya, Ramesh Maragani, Brigitte Voit, and Franziska Lissel. 2021. "Charge Carrier Mobility Improvement in Diketopyrrolopyrrole Block-Copolymers by Shear Coating" Polymers 13, no. 9: 1435. https://doi.org/10.3390/polym13091435

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