Effect of Nonconjugated Spacers on Mechanical Properties of Semiconducting Polymers for Stretchable Transistors

Mun, Jaewan; Wang, Ging‐Ji Nathan; Oh, Jin Young; Katsumata, Toru; Lee, Franklin L.; Kang, Jiheong; Wu, Hung‐Chin; Lissel, Franziska; Rondeau‐Gagné, Simon; Tok, Jeffrey B. ‐H.; Bao, Zhenan

doi:10.1002/adfm.201804222

Effect of Nonconjugated Spacers on Mechanical Properties of Semiconducting Polymers for Stretchable Transistors

Journal Article · Wed Sep 05 00:00:00 EDT 2018 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201804222· OSTI ID:1468671

Mun, Jaewan ^[1]; Wang, Ging‐Ji Nathan ^[1]; Oh, Jin Young ^[2]; Katsumata, Toru ^[3]; Lee, Franklin L. ^[1]; Kang, Jiheong ^[1]; Wu, Hung‐Chin ^[1]; Lissel, Franziska ^[4]; Rondeau‐Gagné, Simon ^[5]; Tok, Jeffrey B. ‐H. ^[1]; ^[1]

Department of Chemical Engineering Stanford University Stanford CA 94305‐5025 USA
Department of Chemical Engineering Stanford University Stanford CA 94305‐5025 USA, Department of Chemical Engineering Kyung Hee University Yongin 17104 Republic of Korea
Department of Chemical Engineering Stanford University Stanford CA 94305‐5025 USA, Corporate Research and Development Performance Materials Technology Center Asahi Kasei Corporation 2‐1 Samejima Fuji Shizuoka 416‐8501 Japan
Department of Chemical Engineering Stanford University Stanford CA 94305‐5025 USA, Institute of Macromolecular Chemistry Leibniz Institute of Polymer Research Dresden Hohe Straße 6 01067 Dresden Germany
Department of Chemical Engineering Stanford University Stanford CA 94305‐5025 USA, Department of Chemistry and Biochemistry University of Windsor 401 Sunset Ave. Ontario N9B3P4 Canada

Abstract

Nonconjugated segments in polymer semiconductors have been utilized to improve the processability of semiconducting polymers. Recently, several reports have described the improvement of stretchability of polymer semiconductors by incorporating nonconjugated spacers. However, the effect of relative flexibility of such conjugation breakers on mechanical and electrical properties has not yet been studied systematically. Here, conjugation breakers with different chain length and rigidity are incorporated into the backbone of diketopyrrolopyrrole‐based semiconductors. Interestingly, it is observed that the longer and more flexible conjugation breakers result in greater ductility and lower elastic modulus without significantly affecting mobility. The enhancement of stretchability is attributed to the reduced modulus and the decrease in crystallinity, as confirmed by X‐ray diffraction. With this newly established molecular design, transistors are prepared with a semiconducting polymer containing dodecyl segments as conjugation breakers. It is observed that this polymer retains a mobility of >0.36 cm ² V ⁻¹ s ⁻¹ at 100% strain, and after 100 cycles at 50% strain. Finally, its high stability against strain is also observed with a fully stretchable transistor fabricated. Taken together, the above results indicate that molecular engineering of conjugated polymers, i.e., by incorporating suitable conjugation breakers, can effectively tune mechanical properties without significantly compromising their electrical properties.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1468671

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 43 Vol. 28; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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