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Template-Assisted Fabrication of Single-Crystal-Like Polymer Fibers for Efficient Charge Transport

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Abstract

Polymer semiconductors with highly crystalline forms, such as crystalline nanowires and fibers, are critical for charge carrier transport in organic field-effect transistors (OFET). However, the highly crystalline form usually requires high-quality molecular orderliness, which still remains a great challenge, especially in single fibers of extremely high-molecular-weight semiconducting polymers. In this study, we present an anodic aluminum oxide (AAO) template-assisted method to fabricate highly crystalline N-alkyl diketopyrrolopyrrole dithienylthieno[3,2-b]thiophene (DPP-DTT) single fibers. Grazing-incidence X-ray diffraction and selected area electron diffraction show obvious diffraction patterns for single-crystal-like characteristics, indicating the highly ordered molecular chains and highly crystalline structures of the single DPP-DTT fibers. OFET based on the single-crystal-like DPP-DTT fiber exhibits the highest charge carrier mobility of up to 14.2 cm2 V−1 s−1 and an average mobility of approximately 7.8 cm2 V−1 s−1, which is significantly improved compared with DPP-DTT thin film-based devices. Besides, the fiber-based OFET also exhibit a high light responsivity of 4.0 × 103 A W−1. This work demonstrates a facile and effective method for fabricating single-crystal-like fibers of high-molecular-weight polymer semiconductors and corresponding high-performance OFET devices. Furthermore, it also expands application of AAO template method for achieving crystalline semiconducting polymer fibers and provide a new perspective for the study on polymer crystallization.

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Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (Grant No. 61890940, 51903051), the Natural Science Foundation of Shanghai (Grant 22ZR1407800). The authors thank beamline BL14B1 of the Shanghai Synchrotron Radiation Facility (SSRF, China) for providing the beam time and helps during experiments.

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Authors and Affiliations

  1. Laboratory of Molecular Materials and Devices, Department of Materials Science, Fudan University, Shanghai, 200433, People’s Republic of China

    Zeng Wu, Yangjiang Wu, Longfei Yang, Xiaochan Zuo, Zhihui Wang, Yongkun Yan, Wenhao Li, Dongdong Chang, Xuefeng Lu, Yunqi Liu & Yan Zhao

  2. Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids,, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, People’s Republic of China

    Yunlong Guo & Yunqi Liu

  3. Shanghai Frontiers Science Research Base of Intelligent Optoelectronic and Perception, Institute of Optoelectronic and Department of Material Science, Fudan University, Shanghai, 200433, People’s Republic of China

    Xiaochan Zuo & Xiaoliang Mo

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  1. Zeng Wu
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Wu, Z., Wu, Y., Yang, L. et al. Template-Assisted Fabrication of Single-Crystal-Like Polymer Fibers for Efficient Charge Transport. Adv. Fiber Mater. 5, 2069–2079 (2023). https://doi.org/10.1007/s42765-023-00326-z

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